Network Working Group S. Nandakumar Internet-Draft C. Jennings Intended status: Informational Cisco Expires: March 20, 2016 September 17, 2015 SDP for the WebRTC draft-ietf-rtcweb-sdp-00 Abstract The Web Real-Time Communication [WebRTC] working group is charged to provide protocol support for direct interactive rich communication using audio, video and data between two peers' web browsers. With in the WebRTC framework, Session Description protocol (SDP) [RFC4566] is used for negotiating session capabilities between the peers. Such a negotiation happens based on the SDP Offer/Answer exchange mechanism described in [RFC3264]. This document provides an informational reference in describing the role of SDP and the Offer/Answer exchange mechanism for the most common WebRTC use-cases. This SDP examples provided in this document is still a work in progress, but it aims to align closest to the evolving standards work. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on March 20, 2016. Nandakumar & Jennings Expires March 20, 2016 [Page 1] Internet-Draft SDP4WebRTC September 2015 Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. SDP and the WebRTC . . . . . . . . . . . . . . . . . . . . . 3 4. Offer/Answer and the WebRTC . . . . . . . . . . . . . . . . . 5 5. WebRTC Session Description Examples . . . . . . . . . . . . . 6 5.1. Some Conventions . . . . . . . . . . . . . . . . . . . . 7 5.2. Basic Examples . . . . . . . . . . . . . . . . . . . . . 8 5.2.1. Audio Only Session . . . . . . . . . . . . . . . . . 8 5.2.2. Audio/Video Session . . . . . . . . . . . . . . . . . 11 5.2.3. Data Only Session . . . . . . . . . . . . . . . . . . 16 5.2.4. Audio Call On Hold . . . . . . . . . . . . . . . . . 19 5.2.5. Audio with DTMF Session . . . . . . . . . . . . . . . 23 5.2.6. One Way Audio/Video Session - Document Camera . . . . 27 5.2.7. Audio, Video Session with BUNDLE Support Unknown . . 31 5.2.8. Audio, Video and Data Session . . . . . . . . . . . . 38 5.2.9. Audio, Video Session with BUNDLE Unsupported . . . . 43 5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) . . . . 47 5.2.11. Audio Only, Add Video to BUNDLE . . . . . . . . . . . 52 5.3. MultiResolution, RTX, FEC Examples . . . . . . . . . . . 59 5.3.1. Sendonly Simulcast Session with 2 cameras and 2 encodings per camera . . . . . . . . . . . . . . 59 5.3.2. Successful SVC Video Session . . . . . . . . . . . . 65 5.3.3. Successful Simulcast Video Session with Retransmission . . . . . . . . . . . . . . . . . . . 70 5.3.4. Successful 1-way Simulcast Session with 2 resolutions and RTX - One resolution rejected . . . . . . 74 5.3.5. Simulcast Video Session with Forward Error Correction 79 5.4. Others . . . . . . . . . . . . . . . . . . . . . . . . . 83 5.4.1. Audio Session - Voice Activity Detection . . . . . . 83 5.4.2. Audio Conference - Voice Activity Detection . . . . . 86 5.4.3. Successful legacy Interop Fallback with bundle-only . 90 Nandakumar & Jennings Expires March 20, 2016 [Page 2] Internet-Draft SDP4WebRTC September 2015 5.4.4. Legacy Interop with RTP/AVP profile . . . . . . . . . 94 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 99 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 99 8. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 99 9. Informative References . . . . . . . . . . . . . . . . . . . 101 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 104 1. Introduction Javascript Session Exchange Protocol(JSEP) [I-D.ietf-rtcweb-jsep] specifies a generic protocol needed to generate [RFC3264] Offers and Answers negotiated between the WebRTC peers for setting up, updating and tearing down a WebRTC session. For this purpose, SDP is used to construct [RFC3264] Offers/Answers for describing (media and non- media) streams as appropriate for the recipients of the session description to participate in the session. The remainder of this document is organized as follows: Sections 3 and 4 provides an overview of SDP and the Offer/Answer exchange mechanism. Section 5 provides sample SDP generated for the most common WebRTC use-cases. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 3. SDP and the WebRTC The purpose of this section is to provide a general overview of SDP and its components. For a more in-depth understanding, the readers are advised to refer to [RFC4566]. The Session Description Protocol (SDP) [RFC4566] describes multimedia sessions, which can contain audio, video, whiteboard, fax, modem, and other streams. SDP provides a general purpose, standard representation to describe various aspects of multimedia session such as media capabilities, transport addresses and related metadata in a transport agnostic manner, for the purposes of session announcement, session invitation and parameter negotiation. As of today SDP is widely used in the context of Session Initiation Protocol [RFC3261], Real-time Transport Protocol [RFC3550] and Real- time Streaming Protocol applications [RFC2326]. Below figure introduces high-level breakup of SDP into components that semantically describe a multimedia session, in our case, a Nandakumar & Jennings Expires March 20, 2016 [Page 3] Internet-Draft SDP4WebRTC September 2015 WebRTC session [WebRTC]. It by no means captures everything about SDP and hence, should be used for informational purposes only. +---------------------+ | v= | +---------------------+ +---------------------+ +---------------------+ ==== | Session Metadata | ===== | o= | | +---------------------+ +---------------------- | +---------------------+ | | t= | | +---------------------+ | | | +---------------------+ | | c= | | +---------------------+ | +---------------------+ ==== | Network Description | ===== | +---------------------+ | +---------------------+ | | a=candidate | | +---------------------+ | | | +---------------------+ | | m= | | +---------------------+ | +---------------------+ +---------------------+ ==== | Stream Description | ===== | a=rtpmap | | +---------------------+ +---------------------- | +---------------------+ | | a=fmtp | | +---------------------+ | +---------------------+ | | a=sendrecv.. | | +---------------------+ +---------------+ | SEMANTIC | | COMPONENTS OF | | SDP | +---------------+ | +---------------------+ | | a=crypto | | +---------------------+ | +---------------------+ +---------------------+ ==== |Security Descriptions| =====| a=ice-frag | | +---------------------+ +---------------------- Nandakumar & Jennings Expires March 20, 2016 [Page 4] Internet-Draft SDP4WebRTC September 2015 | +---------------------+ | | a=ice-pwd | | +---------------------+ | +---------------------+ | | a=fingerprint | | +---------------------+ | | | | +---------------------+ | | a=rtcp-fb | | +---------------------+ | +---------------------+ +---------------------+ ==== | Qos,Grouping | | | | Descriptions | =====| a=group | +---------------------+ +---------------------- +---------------------+ | a=rtcpmux | +---------------------+ Figure 1: Semantic Components of SDP [WebRTC] proposes JavaScript application to fully specify and control the signaling plane of a multimedia session as described in the JSEP specification [I-D.ietf-rtcweb-jsep]. JSEP provides mechanisms to create session characterization and media definition information to conduct the session based on SDP exchanges. In this context, SDP serves two purposes: 1. Provide grammatical structure syntactically. 2. Semantically convey participant's intention and capabilities required to successfully negotiate a session. 4. Offer/Answer and the WebRTC This section introduces SDP Offer/Answer Exchange mechanism mandated by WebRTC for negotiating session capabilities while setting up, updating and tearing down a WebRTC session. This section is intentionally brief in nature and interested readers are recommended to refer [RFC3264] for specific details on the protocol operation. Nandakumar & Jennings Expires March 20, 2016 [Page 5] Internet-Draft SDP4WebRTC September 2015 The Offer/Answer [RFC3264] model specifies rule for the bilateral exchange of Session Description Protocol (SDP) messages for creation of multimedia streams. It defines protocol with involved participants exchanging desired session characteristics from each others perspective constructed as SDP to negotiate the session between them. In the most basic form,the protocol operation begins by one of the participants sending an initial SDP Offer describing its intent to start a multimedia communication session. The participant receiving the offer MAY generate an SDP Answer accepting the offer or it MAY reject the offer. If the session is accepted the Offer/Answer model guarantees a common view of the multimedia session between the participants. At any time, either participant MAY generate a new SDP offer that updates the session in progress. With in the context of WebRTC, the Offer/Answer model defines the state-machinery for WebRTC peers to negotiate session descriptions between them during the initial setup stages as well as for eventual session updates. Javascript Session Establishment Protocol specification [I-D.ietf-rtcweb-jsep] for WebRTC provides the mechanism for generating [RFC3264] SDP Offers and Answers in order for both sides of the session to agree upon details such as list of media formats to be sent/received, bandwidth information, crypto parameters, transport parameters, for example. 5. WebRTC Session Description Examples A typical web based real-time multimedia communication session can be characterized as below: o It has zero or more Audio only, Video only or Audio/Video RTP Sessions, o MAY contain zero or more non-media data sessions, o All the sessions are secured with DTLS-SRTP, o Supports NAT traversal using ICE mechanism, o Provides RTCP based feedback mechanisms, o Sessions can be over IPv4-only, IPv6-only, dual-stack based clients. Nandakumar & Jennings Expires March 20, 2016 [Page 6] Internet-Draft SDP4WebRTC September 2015 5.1. Some Conventions The examples given in this document follow the conventions listed below: o In all the examples, Alice and Bob are assumed to be the WebRTC peers. o [I-D.ietf-mmusic-sdp-bundle-negotiation] support for multiplexing several media streams over a single underlying transport is assumed by default unless explicitly specified otherwise. o Call-flow diagrams that accompany the use-cases capture only the prominent aspects of the system behavior and intentionally is not detailed to improve readability. o Eventhough the call-flow diagrams shows SDP being exchanged between the parties, it doesn't represent the only way an WebRTC setup is expected to work. Other approaches may involve WebRTC applications to exchange the media setup information via non-SDP mechanisms as long as they confirm to the [I-D.ietf-rtcweb-jsep] API specification. o The SDP examples deviate from actual on-the-wire SDP notation in several ways. This is done to facilitate readability and to conform to the restrictions imposed by the RFC formatting rules. * Any SDP line that is indented (compared to the initial line in the SDP block) is a continuation of the preceding line. The line break and indent are to be interpreted as a single space character. * Empty lines in any SDP example are inserted to make functional divisions in the SDP clearer, and are not actually part of the SDP syntax. * Excepting the above two conventions, line endings are to be interpreted as pairs (that is, an ASCII 13 followed by an ASCII 10). o Against each SDP line, pointers to the appropriate RFCs are provided for further informational reference. Also an attempt has been made to provide explanatory notes to enable better understanding of the SDP usage, wherever appropriate. o Following SDP details are common across all the use-cases defined in this document unless mentioned otherwise. Nandakumar & Jennings Expires March 20, 2016 [Page 7] Internet-Draft SDP4WebRTC September 2015 * DTLS fingerprint for SRTP (a=fingerprint) * RTP/RTCP Multiplexing (a=rtcp-mux) * RTCP Feedback support (a=rtcp-fb) * Host and server-reflexive candidate lines (a=candidate) * SRTP Setup framework parameters (a=setup) * RTCP attribute (a=rtcp) * RTP header extension indicating audio-levels from client to the mixer For more details, readers are recommended to refer to [I-D.ietf-rtcweb-jsep] specification. o The term "Session" is used rather loosely in this document to refer to either a "Communication Session" or a "RTP Session" or a "RTP Stream" depending on the context. o Payload type 109 is usually used for OPUS, 0 for PCMU, 8 for PCMA, 99 for H.264 and 120 for VP8 in most of the examples to maintain uniformity. o In the actual use the values that represent SSRCs, ICE candidate foundations, WebRTC Mediastream and MediaStreamTrack Ids shall be much larger and random than the ones shown in the examples. [OPEN ISSUE-1]: SDP Examples for Data Channel, Simulcast, SVC are still being discussed and doesn't represent the final solution. 5.2. Basic Examples 5.2.1. Audio Only Session This common scenario shows SDP for secure two-way audio session with Alice offering Opus, PCMU, PCMA and Bob accepting all the offered audio codecs. Nandakumar & Jennings Expires March 20, 2016 [Page 8] Internet-Draft SDP4WebRTC September 2015 2-Way Audio Only Session Alice Bob | | | | | Offer(Audio:Opus,PCMU,PCMA) | |------------------------------------>| | | | | | Answer(Audio:Opus,PCMU,PCMA) | |<------------------------------------| | | | | |Two-way Opus Audio (preferred-codec) | |.....................................| | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=ptime:60 | [I-D.ietf-payload-rtp-opus] - | | | Opus packetization of 60ms | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Alice supports RTP | Nandakumar & Jennings Expires March 20, 2016 [Page 9] Internet-Draft SDP4WebRTC September 2015 | hdrext:ssrc-audio-level | header extension to indicate | | | audio levels | | a=sendrecv | [RFC3264] - Alice can send and | | | recv audio | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | | : 1f:66:79:a8:07 | | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | | 474af08a068 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host Candidate | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | | 192.168.1.4 54609 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | | 24.23.204.141 64678 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | | 24.23.204.141 64678 typ srflx | Reflexive Candidate | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 1: 5.2.1 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 98.248.92.77 | [RFC4566] | Nandakumar & Jennings Expires March 20, 2016 [Page 10] Internet-Draft SDP4WebRTC September 2015 | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | | Opus Codec | | a=ptime:60 | [I-D.ietf-payload-rtp-opus] | | | Packetization of 60ms | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Bob supports audio | | hdrext:ssrc-audio-level | level RTP header extension as | | | well | | a=sendrecv | [RFC3264] - Bob can send and | | | recv audio | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing on port 49203 | | a=fingerprint:sha-1 c9:c7:70:9d: | [RFC5245] - DTLS Fingerprint | | 1f:66:79:a8:07:99:41:49:83:4a: | for SRTP | | 97:0e:1f:ef:6d:f7 | | | a=ice-ufrag:05067423 | [RFC5245] - ICE user fragment | | a=ice-pwd:1747d1ee3474a28a397a4c | [RFC5245] - ICE password | | 3f3af08a068 | parameter | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP/RTCP Host ICE | | 192.168.1.7 49203 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP/RTCP Server | | 98.248.92.77 60654 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.7 rport 49203 | | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=ssrc:54321 | [RFC5576] | | cname:NWs1ao1HmN4Xa5/yvY7 | | | a=rtcp-rsize | [RFC5506] - Bob intends to use | | | reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 2: 5.2.1 SDP Answer 5.2.2. Audio/Video Session Alice and Bob establish a two-way audio and video session with Opus as the audio codec and H.264 as the video codec. Nandakumar & Jennings Expires March 20, 2016 [Page 11] Internet-Draft SDP4WebRTC September 2015 2-Way Audio,Video Session Alice Bob | | | | |Offer(Audio:Opus,PCMU,PCMA Video:H.264,VP8) | |------------------------------------------->| | | | | | Answer(Audio:Opus,Video:H.264) | |<-------------------------------------------| | | | | | Two-way Opus Audio, H.264 Video | |............................................| | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=ptime:60 | [I-D.ietf-payload-rtp-opus] - | | | Opus packetization of 60ms | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | Nandakumar & Jennings Expires March 20, 2016 [Page 12] Internet-Draft SDP4WebRTC September 2015 | a=sendrecv | [RFC3264] - Alice can send and | | | recv audio | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | | 474af08a068 | parameter | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host Candidate | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | | 192.168.1.4 54609 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | | 24.23.204.141 64678 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | | 24.23.204.141 64678 typ srflx | Reflexive Candidate. | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 99 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:99 H264/90000 | [RFC3984] - H.264 Video Codec | | a=fmtp:99 profile-level- | [RFC3984] | | id=4d0028;packetization-mode=1 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] - VP8 | | | video codec | | a=sendrecv | [RFC3264] - Alice can send and | | | recv video | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | Nandakumar & Jennings Expires March 20, 2016 [Page 13] Internet-Draft SDP4WebRTC September 2015 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | | 474af08a068 | parameter | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host ICE | | 192.168.1.4 54609 typ host | Candidate | | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | | 192.168.1.4 54609 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | | 24.23.204.141 64678 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | | 24.23.204.141 64678 typ srflx | Reflexive Candidate | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:99 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=rtcp-fb:99 nack pli | [RFC5104] - Indicates support | | | for Picture loss Indication | | | and NACK | | a=rtcp-fb:99 ccm fir | [RFC5104] - Full Intra Frame | | | Request-Codec Control Message | | | support | | a=rtcp-fb:120 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=rtcp-fb:120 nack pli | [RFC5104] - Indicates support | | | for Picture loss Indication | | | and NACK | | a=rtcp-fb:120 ccm fir | [RFC5104] - Full Intra Frame | | | Request-Codec Control Message | | | support | | a=ssrc:1366781083 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 3: 5.2.2 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | Nandakumar & Jennings Expires March 20, 2016 [Page 14] Internet-Draft SDP4WebRTC September 2015 | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts only Opus Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:60 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] - Bob can send and | | | recv audio | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 3618095783 | [RFC5245] - RTP/RTCP Host ICE | | 192.168.1.7 49203 typ host | Candidate | | a=candidate:1 1 UDP 565689203 | [RFC5245] - RTP/RTCP Server | | 98.248.92.77 60065 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:1366788312 | [RFC5576] | | cname:1f0fcgEocUG/yvY7 | | | a=rtcp-rsize | [RFC5506] - Bob intends to use | | | reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 99 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtpmap:99 H264/90000 | [RFC3984] - Bob accepts H.264 | Nandakumar & Jennings Expires March 20, 2016 [Page 15] Internet-Draft SDP4WebRTC September 2015 | | Video Codec. | | a=fmtp:99 profile-level- | [RFC3984] | | id=4d0028;packetization-mode=1 | | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing | | a=sendrecv | [RFC3264] - Bob can send and | | | recv video | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] - Host ICE Candidate | | 192.168.1.7 49203 typ host | for Opus Stream | | a=candidate:1 1 UDP 1694302207 | [RFC5245] - Server Reflexive | | 98.248.92.77 60065 typ srflx | ICE Candidate for the above | | raddr 192.168.1.7 rport 49203 | host candidate | | [RFC5245] - Server Reflexive | a=rtcp-fb:99 nack | | Candidate for the Second Host | | | Candidate | | | [RFC5104] - Indicates support | a=rtcp-fb:99 nack pli | | for NACK based RTCP feedback | | | [RFC5104] - Indicates support | a=rtcp-fb:99 ccm fir | | for Picture loss Indication and | | | NACK | | | [RFC5104] - Full Intra Frame | a=ssrc:3229706345 | | Request- Codec Control Message | cname:Q/NWs1ao1HmN4Xa5 | | support | | | [RFC5576] | a=rtcp-rsize | | [RFC5506] - Bob intends to use | a=ice-options:trickle | | reduced size RTCP for this | | | session | | | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 4: 5.2.2 SDP Answer 5.2.3. Data Only Session This scenario illustrates SDP negotiated to setup a data-only session based on SCTP Data Channel, thus enabling use-cases such as file- transfer for example. Nandakumar & Jennings Expires March 20, 2016 [Page 16] Internet-Draft SDP4WebRTC September 2015 2-Way DataChannel Session Alice Bob | | | | | | | Offer(DataChannel) | |-------------------------------->| | | | | | Answer(DataChannel) | |<--------------------------------| | | | | | Two-way SCTP based DataChannel | |.................................| | | | | Nandakumar & Jennings Expires March 20, 2016 [Page 17] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE data | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-ufrag:074c6550 | [RFC5245] - Session Level ICE | | | parameter | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - Session Level ICE | | 474af08a068 | parameter | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Session DTLS | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | Fingerprint for SRTP | | 9d:1f:66:79:a8:07 | | | m=application 56966 DTLS/SCTP | [I-D.ietf-rtcweb-data-channel] | | 5000 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | | DataChannel | | | streams=16;label="channel 1"; | | | subprotocol="chat"; | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=sendrecv | [RFC3264] - Alice can send and | | | recv non-media data | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 56966 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 24.23.204.141 56966 typ srflx | | | raddr 192.168.1.7 rport 56966 | | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 5: 5.2.3 SDP Offer Nandakumar & Jennings Expires March 20, 2016 [Page 18] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE data | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=application 55700 DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | | 5000 | | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | | DataChannel:5000 | | | streams=1;label="channel 1" | | | ;subprotocol="chat"; | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=sendrecv | [RFC3264] - Bob can send and | | | recv non-media data | | a=ice-ufrag:c300d85b | [RFC5245] - Session Level ICE | | | username frag | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - Session Level ICE | | 7efbabd9a2 | password | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Session DTLS | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | Fingerprint for SRTP | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 55700 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 55700 typ srflx | | | raddr 192.168.1.7 rport 55700 | | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 6: 5.2.3 SDP Answer 5.2.4. Audio Call On Hold Alice calls Bob, but when Bob answers he places Alice on hold by setting the SDP direction attribute to a=sendonly in the Answer. Nandakumar & Jennings Expires March 20, 2016 [Page 19] Internet-Draft SDP4WebRTC September 2015 Audio On Hold Alice Bob | | | | | Offer(Audio:Opus) | |-------------------------------->| | | | | | Answer(Audio:Opus,a=sendonly) | |<--------------------------------| | | | | | One-way Opus Audio | |.................................| | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] - | | | Opus packetization of 20ms | | a=sendrecv | [RFC3264] - Alice can send and | | | recv audio | Nandakumar & Jennings Expires March 20, 2016 [Page 20] Internet-Draft SDP4WebRTC September 2015 | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=ssrc:3229706345 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 7: 5.2.4 SDP Offer Nandakumar & Jennings Expires March 20, 2016 [Page 21] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts Opus Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendonly | [RFC3264] - Bob puts call On | | | Hold | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:1366781083 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 8: 5.2.4 SDP Answer Nandakumar & Jennings Expires March 20, 2016 [Page 22] Internet-Draft SDP4WebRTC September 2015 5.2.5. Audio with DTMF Session In this example, Alice wishes to establish two separate audio streams, one for normal audio and the other for telephone-events. Alice offers first audio stream with three codecs and the other with [RFC2833] tones (for DTMF). Bob accepts both the audio streams by choosing Opus as the audio codec and telephone-event for the other stream. Audio Session with DTMF Alice Bob | | | | | | | Offer(Audio:Opus,PCMU,PCMA Audio:telephone-event)| |-------------------------------------------------->| | | | | | Answer(Audio:Opus, Audio:telephone-event) | |<--------------------------------------------------| | | | | | Opus audio stream and telephone-event stream | |...................................................| | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio dtmf | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | Nandakumar & Jennings Expires March 20, 2016 [Page 23] Internet-Draft SDP4WebRTC September 2015 | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] - | | | Opus packetization of 20ms | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=sendrecv | [RFC3264] - Alice can send and | | | recv audio | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | | 474af08a068 | parameter | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=ssrc:3229706345 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 126 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:dtmf | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp-mux | [RFC5761] | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:126 telephone- | [RFC2833] | | event/8000 | | Nandakumar & Jennings Expires March 20, 2016 [Page 24] Internet-Draft SDP4WebRTC September 2015 | a=sendonly | [RFC3264] - Alice can send | | | DTMF Events | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | | 474af08a068 | parameter | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=ssrc:9032206345 | [RFC5576] | | cname:L/N9lk1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 9: 5.2.5 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio dtmf | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | Nandakumar & Jennings Expires March 20, 2016 [Page 25] Internet-Draft SDP4WebRTC September 2015 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts Opus Codec | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] - Bob can send and | | | receive Opus audio | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing on port 49203 | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Fingerprint for | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | SRTP | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:0634322975 | [RFC5576] | | cname:Q/o1HmN4XNWs1aa5 | | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 126 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:dtmf | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtpmap:126 telephone- | [RFC2833] | | event/8000 | | | a=recvonly | [RFC3264] - Alice can receive | | | DTMF events | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing on port 54690 | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Fingerprint for | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | SRTP | Nandakumar & Jennings Expires March 20, 2016 [Page 26] Internet-Draft SDP4WebRTC September 2015 | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:6345903220 | [RFC5576] | | cname:L/k1aN9lo1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for this | | | session | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 10: 5.2.5 SDP Answer 5.2.6. One Way Audio/Video Session - Document Camera In this scenario Alice and Bob engage in a 1 way audio and video session with Bob receiving Alice's audio and her presentation slides as video stream. One Way Audio & Video Session - Document Camera Alice Bob | | | | | | | Alice Offers sendonly audio and video streams. | | The video stream corresponds to her presentation | | | | Offer(Audio:Opus, Video: VP8) | |----------------------------------------------------->| | | | | | (Audio:Opus, Video: VP8) | |<-----------------------------------------------------| | | | | | One-way Opus Audio, VP8 Video | |......................................................| | Bob can hear Alice and see her presentation slides.| | | | | Nandakumar & Jennings Expires March 20, 2016 [Page 27] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp-mux | [RFC5761] | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendonly | [RFC3264] - Send only audio | | | stream | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 24.23.204.141 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5104] | | 24.23.204.141 54609 typ host | | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:6345903220 | [RFC5576] | | cname:L/k1aN9lo1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | Nandakumar & Jennings Expires March 20, 2016 [Page 28] Internet-Draft SDP4WebRTC September 2015 | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp-mux | [RFC5761] | | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=content:slides | [RFC4796] -Alice's | | | presentation video stream | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 24.23.204.141 54609 typ host | | | a=candidate:0 2 UDP 2113667326 | [RFC5104] | | 24.23.204.141 54609 typ host | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:3429951804 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 11: 5.2.6 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | Nandakumar & Jennings Expires March 20, 2016 [Page 29] Internet-Draft SDP4WebRTC September 2015 | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=recvonly | [RFC3264] - Receive only audio | | | stream | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 98.248.92.77 49203 typ host | | | a=ssrc:9513429804 | [RFC5576] | | cname:Q/o1HmNWs1aN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=content:slides | [RFC4796] | | a=recvonly | [RFC3264] - Receive Only | | | Alice's presentation stream | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 98.248.92.77 49203 typ host | | | a=ssrc:1366781083 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] | Nandakumar & Jennings Expires March 20, 2016 [Page 30] Internet-Draft SDP4WebRTC September 2015 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 12: 5.2.6 SDP Answer 5.2.7. Audio, Video Session with BUNDLE Support Unknown In this example, since Alice is unsure of the Bob's support of the BUNDLE framework, following 3 step procedures are performed in order to negotiate and setup a BUNDLE Address for the session o An SDP Offer, in which the Alice assigns unique addresses to each "m=" line in the BUNDLE group, and requests the Answerer to select the Offerer's BUNDLE address. o An SDP Answer, in which the Bob indicates its support for BUNDLE, and assigns its own BUNDLE address for the BUNDLED m= lines. o A subsequent SDP Offer from Alice, which is used to perform BUNDLE Address Synchronization (BAS). Once the Offer/Answer exchange completes, both Alice and Bob each end up using single RTP Session for both the Media Streams. Nandakumar & Jennings Expires March 20, 2016 [Page 31] Internet-Draft SDP4WebRTC September 2015 Two-Way Secure Audio,Video with BUNDLE support unknown Alice Bob | | | | | Alice offers BUNDLE support with unique address | | for the audio and video m-line | | | | | | Offer(Audio:Opus Video:VP8) | |----------------------------------------------------->| | |Bob | |supports | |BUNDLE | Answer(Audio:Opus Video:VP8) | |<-----------------------------------------------------| | | | |Bob uses | |identical | |addresses | | | Updated Offer for Bundle Address Synchronization. | |----------------------------------------------------->| | | | | | Answer (Bob accepts the updated offer) | |<-----------------------------------------------------| | | | | | 2 Way Call with Audio and Video Multiplexed | |......................................................| | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | Nandakumar & Jennings Expires March 20, 2016 [Page 32] Internet-Draft SDP4WebRTC September 2015 | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] Audio m=line part of | | | BUNDLE group with a unique | | | port number | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp-mux | [RFC5761] | | a=rtcp:54609 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 62537 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:video | [RFC5888] Video m=line part of | | | the Bundle group with a unique | | | port number | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp-mux | [RFC5761] | Nandakumar & Jennings Expires March 20, 2016 [Page 33] Internet-Draft SDP4WebRTC September 2015 | a=rtcp:62537 IN IP4 | [RFC3605] - Port for RTCP data | | 24.23.204.141 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=ssrc:22222 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ice-ufrag:6550074c | [RFC5245] | | a=ice-pwd:74af08a068a28a397a4c3f | [RFC5245] | | 31747d1ee34 | | | a=fingerprint:sha-1 1f:ef:6d:f7: | [RFC5245] | | c9:c7:70:9d:1f:66:99:41:49:83: | | | 4a:97:0e79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 62537 typ host | | | a=candidate:0 2 2122194687 | [RFC5245] | | 192.168.1.4 62537 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 62537 typ srflx | | | raddr 192.168.1.4 rport 62537 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 62537 typ srflx | | | raddr 192.168.1.4 rport 62537 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 13: 5.2.7 SDP Offer w/BUNDLE +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Bob supports BUNDLE | | | semantics. | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | Nandakumar & Jennings Expires March 20, 2016 [Page 34] Internet-Draft SDP4WebRTC September 2015 | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] Audio m=line part of | | | the BUNDLE group | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-fb:109 nack | [RFC5104] | | a=rtcp-mux | [RFC5761] | | a=ssrc:33333 | [RFC5576] | | cname:Q/1HmN4Xa5NWs1ao | | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:video | [RFC5888] Video m=line part of | | | the BUNDLE group with the port | | | from audio line repeated | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=ssrc:44444 | [RFC5576] | | cname:Q/2AqlmN4Xa5NWs | | | a=ice-ufrag:85bc300d | [RFC5245] | | a=ice-pwd:bd2de4e9991c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 41:49:83:4a: | [RFC5245] | Nandakumar & Jennings Expires March 20, 2016 [Page 35] Internet-Draft SDP4WebRTC September 2015 | 99:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 14: 5.2.7 SDP Answer w/BUNDLE +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] - Port number | | | finalized as Bundle Address. | | a=rtcp-mux | [RFC5761] | | a=rtcp:54609 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | Nandakumar & Jennings Expires March 20, 2016 [Page 36] Internet-Draft SDP4WebRTC September 2015 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:22222 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 15: 5.2.7 SDP Offer for BAS Nandakumar & Jennings Expires March 20, 2016 [Page 37] Internet-Draft SDP4WebRTC September 2015 5.2.8. Audio, Video and Data Session This example shows SDP for negotiating a session with Audio, Video and data streams between Alice and Bob with BUNDLE support known. Audio,Video,Data with BUNDLE support known Alice Bob | | | | |Alice indicates BUNDLE support with | |identical address across all the m=lines | | | | | | Offer(Audio:Opus Video:VP8 Data) | |------------------------------------------->| | |Bob does | |the same | Answer(Audio:Opus,Video:VP8 Data) | |<-------------------------------------------| | | | | | | | Two-way Audio,Video, Data multiplexed | |............................................| | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video data | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:54609 IN IP4 | [RFC3605] | Nandakumar & Jennings Expires March 20, 2016 [Page 38] Internet-Draft SDP4WebRTC September 2015 | 24.23.204.141 | | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:11111 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:54609 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | Nandakumar & Jennings Expires March 20, 2016 [Page 39] Internet-Draft SDP4WebRTC September 2015 | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:22222 | [RFC5576] | | cname:Q/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=application 54609 DTLS/SCTP | [I-D.ietf-rtcweb-data-channel] | | 5000 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | | DataChannel | | | streams=1;label="channel 1"; | | | subprotocol="chat"; | | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | +----------------------------------+--------------------------------+ Table 16: 5.2.8 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | Nandakumar & Jennings Expires March 20, 2016 [Page 40] Internet-Draft SDP4WebRTC September 2015 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video data | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | | Bob's trickle support support | | | is indicated at the session | | | level | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:33333 | [RFC5576] | | cname:L/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | Nandakumar & Jennings Expires March 20, 2016 [Page 41] Internet-Draft SDP4WebRTC September 2015 | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:44444 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] | | m=application 49203 DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | | 5000 | | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | | DataChannel | | | streams=16;label="channel 1"; | | | subprotocol="chat"; | | | a=setup:active | [RFC4145] | | a=sendrecv | [RFC3264] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | +----------------------------------+--------------------------------+ Table 17: 5.2.8 SDP Answer Nandakumar & Jennings Expires March 20, 2016 [Page 42] Internet-Draft SDP4WebRTC September 2015 5.2.9. Audio, Video Session with BUNDLE Unsupported This use-case illustrates SDP Offer/Answer exchange where the far-end (Bob) either doesn't support media bundling or doesn't want to group m=lines over a single 5-tuple. On successful Offer/Answer exchange, Alice and Bob each end up using unique 5-tuple for audio and video media streams respectively. Two-Way Secure Audio,Video with BUNDLE Unsupported Alice Bob | | | | | Alice offers BUNDLE support with unique address | | for the audio and video m-line | | | | | | Offer(Audio:Opus Video:VP8) | |----------------------------------------------------->| | |Bob | |doesn't | |support | |BUNDLE | Answer(Audio:Opus Video:VP8) | |<-----------------------------------------------------| | |Bob uses | |unique | |addresses | |across the | |m=lines | | |2Way Call with Audio and Video on different 5-tuples | |......................................................| | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | Nandakumar & Jennings Expires March 20, 2016 [Page 43] Internet-Draft SDP4WebRTC September 2015 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 55232 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] Audio m=line part of | | | BUNDLE group with a unique | | | port number | | a=rtcp:55232 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 55232 typ host | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 55232 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 55232 typ srflx | | | raddr 192.168.1.4 rport 55232 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 55232 typ srflx | | | raddr 192.168.1.4 rport 55232 | | | a=rtcp-rsize | [RFC5506] | | m=video 54332 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | Nandakumar & Jennings Expires March 20, 2016 [Page 44] Internet-Draft SDP4WebRTC September 2015 | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=mid:video | [RFC5888] Video m=line part of | | | the BUNDLE group with a unique | | | port number | | a=rtcp:54332 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=ssrc:22222 | [RFC5576] | | cname:yvY7/EocUG1f0fcg | | | a=ice-ufrag:7872093 | [RFC5245] | | a=ice-pwd:ee3474af08a068a28a397a | [RFC5245] | | 4c3f31747d1 | | | a=fingerprint:sha-1 6d:f7:c9:c7: | [RFC5245] | | 70:9d:1f:66:79:a8:07:99:41: | | | 49:83:4a:97:0e:1f:ef | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 54332 typ host | | | a=candidate:0 2 2122194687 | [RFC5245] | | 192.168.1.4 54332 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54332 typ srflx | | | raddr 192.168.1.4 rport 54332 | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54332 typ srflx | | | raddr 192.168.1.4 rport 54332 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 18: 5.2.9 SDP Offer w/BUNDLE +---------------------------------------+---------------------------+ | SDP Contents | RFC#/Notes | +---------------------------------------+---------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle- | | | ice] | Nandakumar & Jennings Expires March 20, 2016 [Page 45] Internet-Draft SDP4WebRTC September 2015 | m=audio 53214 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID | | | (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opu | | | s] | | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | | :ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opu | | | s] | | a=setup:active | [RFC4145] - Bob carries | | | out DTLS Handshake in | | | parallel | | a=sendrecv | [RFC3264] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice- | [RFC5245] | | pwd:de4e99bd291c325921d5d47efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83:4a:97 | [RFC5245] | | :0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 53214 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 53214 typ srflx raddr | | | 192.168.1.7 rport 53214 | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.7 rport 60065 | | | a=rtcp-rsize | [RFC5506] | | m=video 58679 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID | | | (tb) | | a=rtcp:56507 IN IP4 98.248.92.77 | [RFC3605] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=setup:active | [RFC4145] - Bob carries | | | out DTLS Handshake in | | | parallel | | a=sendrecv | [RFC3264] | | a=ice-ufrag:85bC300 | [RFC5245] | Nandakumar & Jennings Expires March 20, 2016 [Page 46] Internet-Draft SDP4WebRTC September 2015 | a=ice- | [RFC5245] | | pwd:325921d5d47efbabd9a2de4e99bd291c | | | a=fingerprint:sha-1 9d:1f:66:79:a8:07 | [RFC5245] | | :99:41:49:83:4a:97:0e:1f: | | | ef:6d:f7:c9:c7:70 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 58679 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 58679 typ srflx raddr | | | 192.168.1.7 rport 58679 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 56507 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 56507 typ srflx raddr | | | 192.168.1.7 rport 58679 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +---------------------------------------+---------------------------+ Table 19: 5.2.9 SDP Answer without BUNDLE 5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) This example show-cases SDP for negotiating a session with Audio, Video and data streams between Alice and Bob with data stream not being part of the BUNDLE group. This is shown by assigning unique port for data media sections. Nandakumar & Jennings Expires March 20, 2016 [Page 47] Internet-Draft SDP4WebRTC September 2015 Audio, Video, with Data (Not in BUNDLE) Alice Bob | | | | |Alice wants to multiplex audio, video but not data | | | | | | Offer(Audio:Opus Video:VP8, Data(not in BUNDLE)) | |----------------------------------------------------->| | | | | | Answer(Audio:Opus Video:VP8, Data) | |<-----------------------------------------------------| | | | | |2 Way Call with Audio, Video Multiplexed except data | |......................................................| | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice wants to | | | BUNDLE only audio and video | | | media. | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:54609 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | Nandakumar & Jennings Expires March 20, 2016 [Page 48] Internet-Draft SDP4WebRTC September 2015 | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:11111 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:54609 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:22222 | [RFC5576] | | cname:Q/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | m=application 10000 DTLS/SCTP | [I-D.ietf-rtcweb-data-channel] | | 5000 | | Nandakumar & Jennings Expires March 20, 2016 [Page 49] Internet-Draft SDP4WebRTC September 2015 | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | | DataChannel | | | streams=16;label="channel 1"; | | | subprotocol="chat"; | | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=ice-ufrag:89819013 | [RFC5245] | | a=ice-pwd:1747d1ee3474af08a068a2 | [RFC5245] | | 8a397a4c3f3 | | | a=fingerprint:sha-1 0e:1f:ef:6d: | [RFC5245] | | f7:c9:c7:70:99:41:49:83:4a:97: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 10000 typ host | | +----------------------------------+--------------------------------+ Table 20: 5.2.10 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ice-ufrag:c300d85b | [RFC5245] | Nandakumar & Jennings Expires March 20, 2016 [Page 50] Internet-Draft SDP4WebRTC September 2015 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=ssrc:33333 | [RFC5576] | | cname:L/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:44444 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] | | m=application 20000 DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | | 5000 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | | DataChannel | | | streams=1;label="channel 1"; | | | subprotocol="chat"; | | | a=setup:active | [RFC4145] | | a=sendrecv | [RFC3264] | | a=ice-ufrag:991Ca2a5e | [RFC5245] | | a=ice-pwd:921d5d47efbabd9a2de4e9 | [RFC5245] | | 9bd291c325 | | Nandakumar & Jennings Expires March 20, 2016 [Page 51] Internet-Draft SDP4WebRTC September 2015 | a=fingerprint:sha-1 6d:f7:c9:c7: | [RFC5245] | | 70:9d:1f:66:79:a8:07:99:41:49: | | | 83:4a:97:0e:1f:ef | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 20000 typ host | | +----------------------------------+--------------------------------+ Table 21: 5.2.10 SDP Answer 5.2.11. Audio Only, Add Video to BUNDLE This example involves 2 Offer/Answer exchanges. First one setting up Audio-only session followed by an updated Offer/Answer exchange to add video stream to the ongoing session. Also the newly added video stream is BUNDLED with the audio stream. Audio Only , Add Video and BUNDLE Alice Bob | | | | | Alice indicates support for BUNDLE | | | | Offer(Audio:Opus) | |----------------------------------------------------->| | |Bob | |supports | |BUNDLE | Answer(Audio:Opus) | |<-----------------------------------------------------| | |Alice adds | |video stream | Updated Offer(Audio:Opus, Video:VP8) |to BUNDLE |----------------------------------------------------->| | | | |Bob accepts | Updated Answer(Audio:Opus, Video:VP8) | |<-----------------------------------------------------| | | | 2Way Call with Audio and Video Multiplexed | |......................................................| | | | | +----------------------------------+--------------------------------+ Nandakumar & Jennings Expires March 20, 2016 [Page 52] Internet-Draft SDP4WebRTC September 2015 | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice wants to | | | BUNDLE only audio and video | | | media. | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:11111 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | Nandakumar & Jennings Expires March 20, 2016 [Page 53] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ Table 22: 5.2.11 SDP Offer Nandakumar & Jennings Expires March 20, 2016 [Page 54] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:33333 | [RFC5576] | | cname:L/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 23: 5.2.10 SDP Answer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | Nandakumar & Jennings Expires March 20, 2016 [Page 55] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | v=1 | Version number incremented | | | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice wants to | | | BUNDLE only audio and video | | | media. | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | | : 1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:11111 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | Nandakumar & Jennings Expires March 20, 2016 [Page 56] Internet-Draft SDP4WebRTC September 2015 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:22222 | [RFC5576] | | cname:Q/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 24: 5.2.11 SDP Updated Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=1 | [RFC4566] Version number | | | incremented | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | Nandakumar & Jennings Expires March 20, 2016 [Page 57] Internet-Draft SDP4WebRTC September 2015 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:33333 | [RFC5576] | | cname:L/aoNWs11HmN4Xa5 | | | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:video | [RFC5888] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | Nandakumar & Jennings Expires March 20, 2016 [Page 58] Internet-Draft SDP4WebRTC September 2015 | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:44444 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 25: 5.2.11 SDP Updated Answer 5.3. MultiResolution, RTX, FEC Examples This section deals with scenarios related to multi-source, multi- stream negotiation such as layered coding, simulcast, along with techniques that deal with providing robustness against transmission errors such as FEC and RTX. Also to note, mechanisms such as FEC and RTX could be envisioned in the above basic scenarios as well. 5.3.1. Sendonly Simulcast Session with 2 cameras and 2 encodings per camera The SDP below shows Offer/Answer exchange with one audio and two video sources. Each of the video source can be sent at two different resolutions. One video source corresponds to VP8 encoding, while the other corresponds to H.264 encoding. bundle-only framework is used along with BUNDLE grouping framework to enable multiplexing of all the 5 streams (1 audio stream + 4 video streams) over a single RTP Session. Nandakumar & Jennings Expires March 20, 2016 [Page 59] Internet-Draft SDP4WebRTC September 2015 1 Way Successful Simulcast w/BUNDLE Alice Bob | | | | | Alice offers 2 sendonly video sources | | with 2 simulcast encodings per source | | and bundle-only for video | | | | | | Offer(Audio:Opus,Video1:VP8,Video2:H.264) | |------------------------------------------------>| | | | | | Answer(Audio:Opus Video1:VP8,Video2:H.264) | |<------------------------------------------------| | | |One-Way 1 Opus, 2 H.264 and 2 VP8 video streams, | | all multiplexed | |.................................................| | | | | +-------------------------------------+-----------------------------+ | SDP Contents | RFC#/Notes | +-------------------------------------+-----------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] Alice | | | supports grouping of | | | m=lines under BUNDLE | | | semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | | | e] | | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (ta) | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | Nandakumar & Jennings Expires March 20, 2016 [Page 60] Internet-Draft SDP4WebRTC September 2015 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendonly | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:109 nack | [RFC5104] | | a=ssrc:11111 C90alEocUG1f0fcg | [RFC5576] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3474 | [RFC5245] | | af08a068 | | | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | | 97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx raddr | | | 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx raddr | | | 192.168.1.4 rport 64678 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tb) | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding- | | | 1 Resolution | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=imageattr:100 [x=640,y=480] | [RFC6236] | | | Camera-1,Encoding-2 | | | Resolution | | a=fmtp:100 max-fr=15 | [RFC4566] | | a=simulcast: send 98;100 | [I-D.ietf-mmusic-sdp-simulc | | | ast] Alice can send 2 | | | resolutions | | a=ssrc:12345 | [RFC5576] [RFC7022] | | cname:axzo1278npDlAzM73 | Camera-1,Encoding-1 SSRC | Nandakumar & Jennings Expires March 20, 2016 [Page 61] Internet-Draft SDP4WebRTC September 2015 | | with Session CNAME | | a=ssrc:45678 | [RFC5576] [RFC7022] | | cname:axzo1278npDlAzM73 | Camera-1,Encoding-2 SSRC | | | with Session CNAME | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-fb:98 nack | [RFC5104] | | a=rtcp-fb:98 nack pli | [RFC5104] | | a=rtcp-fb:98 ccm fir | [RFC5104] | | a=rtcp-fb:100 nack | [RFC5104] | | a=rtcp-fb:100 nack pli | [RFC5104] | | a=rtcp-fb:100 ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 101 102 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tc | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tc) | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m2 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=rtpmap:102 H264/90000 | [RFC3984] | | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | | ;packetization-mode=1;max-fr=30 | 1 Resolution | | a=fmtp:102 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | | ;packetization-mode=1;max-fr=15 | 2 Resolution | | a=simulcast: send 101;102 | [I-D.ietf-mmusic-sdp-simulc | | | ast] | | a=ssrc:67890 | [RFC5576] [RFC7022] | | cname:axzo1278npDlAzM73 | Camera-2,Encoding-1 SSRC | | | with Session CNAME | | a=ssrc:56789 | [RFC5576] [RFC7022] | | cname:axzo1278npDlAzM73 | Camera-2,Encoding-2 SSRC | | | with Session CNAME | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-fb:101 nack | [RFC5104] | | a=rtcp-fb:101 nack pli | [RFC5104] | | a=rtcp-fb:101 ccm fir | [RFC5104] | | a=rtcp-fb:102 nack | [RFC5104] | | a=rtcp-fb:102 nack pli | [RFC5104] | | a=rtcp-fb:102 ccm fir | [RFC5104] | Nandakumar & Jennings Expires March 20, 2016 [Page 62] Internet-Draft SDP4WebRTC September 2015 | a=rtcp-rsize | [RFC5506] | +-------------------------------------+-----------------------------+ Table 26: 5.3.1 SDP Offer +-------------------------------------+-----------------------------+ | SDP Contents | RFC#/Notes | +-------------------------------------+-----------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] Alice | | | supports grouping of | | | m=lines under BUNDLE | | | semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | | | e] | | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (ta) | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=rtcp-fb:109 nack | [RFC5104] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:22222 | [RFC5576] | | cname:y8/C90alEocUG1f0fcg | | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | | babd9a2 | | | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | | 97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 2 UDP 694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx raddr | | | 192.168.1.4 rport 49203 | | Nandakumar & Jennings Expires March 20, 2016 [Page 63] Internet-Draft SDP4WebRTC September 2015 | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with port | | 100 | repeated from the audio | | | port | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tb) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding- | | | 1 Resolution | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=imageattr:100 [x=640,y=480] | [RFC6236] | | | Camera-1,Encoding-2 | | | Resolution | | a=fmtp:100 max-fr=15 | [RFC4566] | | a=recvonly | [RFC3264] - receive only | | | video stream | | a=simulcast: recv 98;100 | [I-D.ietf-mmusic-sdp-simulc | | | ast] | | a=ssrc:54321 | [RFC5576] | | cname:y8/C90alEocUG1f0fcg | | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | | babd9a2 | | | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | | 97:0e:1f:ef:6d:f7:c9:c7:70:9d: | | | 1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.4 rport 60065 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5576] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-rsize | [RFC5506] | | m=video 54609 UDP/TLS/RTP/SAVPF 101 | BUNDLE accepted with port | | 102 | repeated from the audio | | | port | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:56503 IN IP4 98.248.92.77 | [RFC3605] | | a=msid:ma tc | Identifies RTCMediaStream | | | ID (ma) and | Nandakumar & Jennings Expires March 20, 2016 [Page 64] Internet-Draft SDP4WebRTC September 2015 | | RTCMediaStreamTrack ID (tc) | | a=mid:m2 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=rtpmap:102 H264/90000 | [RFC3984] | | a=recvonly | [RFC3264] | | a=fmtp:101 profile-level-id=4d0028 | [RFC3984] | | ;packetization-mode=1;max-fr=30 | | | a=fmtp:102 profile-level-id=4d0028 | [RFC3984] | | ;packetization-mode=1;max-fr=15 | | | a=simulcast: recv 101;102 | [I-D.ietf-mmusic-sdp-simulc | | | ast] Bob accepts to | | | receieve the offered | | | simulcast streams | | a=ssrc:90876 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | | babd9a2 | | | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | | 97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.7 rport 60065 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5576] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-rsize | [RFC5506] | +-------------------------------------+-----------------------------+ Table 27: 5.3.1 SDP Answer 5.3.2. Successful SVC Video Session This section shows an SDP Offer/Answer for a session with an audio and a single video source. The video source is encoded as layered coding at 3 different resolutions based on [RFC5583]. The video m=line shows 3 streams with last stream (payload 100) dependent on streams with payload 96 and 97 for decoding. Nandakumar & Jennings Expires March 20, 2016 [Page 65] Internet-Draft SDP4WebRTC September 2015 SVC Session - 3 Layers w/BUNDLE Alice Bob | | | | | Alice offers 3 sendonly video streams | | as 3 layers of SVC and bundle-only | | for video streams. | | | | Offer(Video:H.264 SVC) | |------------------------------------------------>| | | | |Bob accepts Alice's | |offered Codec | |operation points | | | Answer(Video:H.264) | |<------------------------------------------------| | | |One-Way H.264 SVC video streams | |.................................................| | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:m0 | [RFC5888] Audio m=line part of | Nandakumar & Jennings Expires March 20, 2016 [Page 66] Internet-Draft SDP4WebRTC September 2015 | | BUNDLE group with a unique | | | port number | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=sendonly | [RFC3264] | | a=rtcp-fb:109 nack | [RFC5104] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=ssrc:67890 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 96 | bundle-only video line with | | 97 100 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tc) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:m1 | [RFC5888] Audio m=line part of | | | BUNDLE group | | a=msid:ma tb | | | a=rtpmap:96 H264/90000 | [RFC3984] | | a=fmtp:96 profile-level- | [RFC3984]H.264 Layer 1 | | id=4d0028; packetization-mode=1 | | | ;max-fr=30;max-fs=8040 | | | a=rtpmap:97 H264/90000 | [RFC3984] | | a=fmtp:97 profile-level- | [RFC3984] H.264 Layer 2 | | id=4d0028;packetization-mode=1; | | | max-fr=15;max-fs=1200 | | Nandakumar & Jennings Expires March 20, 2016 [Page 67] Internet-Draft SDP4WebRTC September 2015 | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | | a=fmtp:100 profile-level- | [RFC3984] | | id=4d0028;packetization-mode=1; | | | max-fr=30;max-fs=8040 | | | a=depend:100 lay m1:96,97; | [RFC5583]Layer 3 dependent on | | | layers 1 and 2 | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=ssrc:1732846380 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=ssrc:1732846381 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=ssrc:1732846382 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 28: 5.3.2 SDP Offer with SVC +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | Nandakumar & Jennings Expires March 20, 2016 [Page 68] Internet-Draft SDP4WebRTC September 2015 | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx | | | raddr 192.168.1.5 rport 60065 | | | a=rtcp-rsize | [RFC5506] | | m=video 54609 UDP/TLS/RTP/SAVPF | BUNDLE accepted Bundle address | | 96 100 | same as audio m=line. | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:56503 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part of | | | BUNDLE group | | a=rtpmap:96 H264/90000 | [RFC3984] | | a=fmtp:96 profile-level- | [RFC3984]H.264 Layer 1 | | id=4d0028;packetization-mode=1; | | | max-fr=30;max-fs=8040 | | | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | | a=fmtp:100 profile-level- | [RFC3984] | | id=4d0028;packetization-mode=1; | | | max-fr=30;max-fs=8040 | | | a=depend:100 lay m1:96; | [RFC5583] Bob chooses 2 Codec | | | Operation points | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.5 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.142 64678 typ srflx | | | raddr 192.168.1.5 rport 64678 | | | a=recvonly | [RFC3264] - Receive only video | | | stream | | a=setup:active | [RFC4145] | Nandakumar & Jennings Expires March 20, 2016 [Page 69] Internet-Draft SDP4WebRTC September 2015 | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=ssrc:4638117328 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 29: 5.3.2 SDP Answer with SVC 5.3.3. Successful Simulcast Video Session with Retransmission This section shows an SDP Offer/Answer exchange for a simulcast scenario with 2 two resolutions and has [RFC4588] style re- transmission flows. Simulcast Streams with Retransmission Alice Bob | | | | |Alice offers single audio and simulcasted video streams | | | | | | Offer(Audio:Opus Video:VP8 with 2 resolutions) | | & RTX stream | |-------------------------------------------------------->| | | | | | Answer (Bob accepts Alice's offer) | |<--------------------------------------------------------| | | | | |One-Way 1 Opus, 2 VP8 and RTX video streams,all muxed | |.........................................................| | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | Nandakumar & Jennings Expires March 20, 2016 [Page 70] Internet-Draft SDP4WebRTC September 2015 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:m0 | [RFC5888] Audio m=line part of | | | BUNDLE group with a unique | | | port number | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=sendonly | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | | 100 101 103 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires March 20, 2016 [Page 71] Internet-Draft SDP4WebRTC September 2015 | | ID (tb) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:m1 | [RFC5888] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:103 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | | a=simulast: send 98;100 | [I-D.ietf-mmusic-sdp-simulcast | | | ] | | a=ssrc-group:FID 12345 34567 | [RFC5888] | | a=ssrc-group:FID 78990 90887 | [RFC5888] | | a=ssrc:12345 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:78990 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:34567 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:90887 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=sendonly | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 30: 5.3.3 SDP Offer w/Simulcast, RTX +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | Nandakumar & Jennings Expires March 20, 2016 [Page 72] Internet-Draft SDP4WebRTC September 2015 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:33333 | [RFC5576] | | cname:L/HmN4Xa5NWs1ao1 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 64678 typ srflx | | | raddr 192.168.1.7 rport 60065 | | | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | | 98 100 101 103 | address identical to audio | | | m-line | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part of | | | BUNDLE group | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:103 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | Nandakumar & Jennings Expires March 20, 2016 [Page 73] Internet-Draft SDP4WebRTC September 2015 | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.772 60065 typ srflx | | | raddr 192.168.1.7 rport 60065 | | | a=simulcast: recv 98;100 | [I-D.ietf-mmusic-sdp-simulcast | | | ] | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 31: 5.3.3 SDP Answer w/Simulcast, RTX 5.3.4. Successful 1-way Simulcast Session with 2 resolutions and RTX - One resolution rejected This section shows an SDP Offer/Answer exchange for a simulcast scenario with 2 two resolutions. It also showcases when Bob rejects one of the Simulcast Video Stream which results in the rejection of the associated repair stream implicitly. Nandakumar & Jennings Expires March 20, 2016 [Page 74] Internet-Draft SDP4WebRTC September 2015 Simulcast Streams with Retransmission Rejected Alice Bob | | | | |Alice offers single audio and simulcasted video streams | | with bundle-only for video | | | | | |Offer(Audio:Opus Video:VP8 with 2 resolutions,RTX Stream)| |-------------------------------------------------------->| | | | |Bob accepts 1 | |simulcast,rtx | |rejects the | |other | Answer(Audio:Opus Video:VP8 with 1 res & RTX Stream) | |<--------------------------------------------------------| | | | | |1-way audio,video session and its associated RTX stream, | | all multiplexed | |.........................................................| | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | Nandakumar & Jennings Expires March 20, 2016 [Page 75] Internet-Draft SDP4WebRTC September 2015 | 24.23.204.141 | | | a=mid:m0 | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=sendonly | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:11111 | [RFC5576] | | cname:LP/NWs1ao1HmN4Xa5 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | | 100 101 103 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:m1 | [RFC5888] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:103 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | | a=simulcast: send 98;100 | [I-D.ietf-mmusic-sdp-simulcast | | | ] | Nandakumar & Jennings Expires March 20, 2016 [Page 76] Internet-Draft SDP4WebRTC September 2015 | a=ssrc-group:FID 12345 34567 | [RFC5888] | | a=ssrc-group:FID 78990 90887 | [RFC5888] | | a=ssrc:12345 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:78990 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:34567 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:90887 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=sendonly | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 32: 5.3.4 SDP Offer w/Simulcast, RTX +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | Nandakumar & Jennings Expires March 20, 2016 [Page 77] Internet-Draft SDP4WebRTC September 2015 | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx | | | raddr 192.168.1.7 rport 60065 | | | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | | 98 101 | address identical to audio | | | m-line | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx | | | raddr 192.168.1.5 rport 60065 | | | a=simulcast: recv 98 | [I-D.ietf-mmusic-sdp-simulcast | | | ] Bob accepts only one | | | simulcast resolution | | a=ssrc:54321 | [RFC5576] | | cname:NWs1ao1HmN4Xa5 | | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Nandakumar & Jennings Expires March 20, 2016 [Page 78] Internet-Draft SDP4WebRTC September 2015 Table 33: 5.3.4 SDP Answer no Simulcast 5.3.5. Simulcast Video Session with Forward Error Correction This section shows an SDP Offer/Answer exchange for Simulcast video stream at two resolutions and and has [RFC5956] style FEC flows. On completion of the Offer/Answer exchange mechanism we end up one audio stream, 2 simulcast video streams and 2 associated FEC streams are sent over a single 5-tuple. Simulcast Streams with Forward Error Correction Alice Bob | | | | | | |Alice offers single audio and simulcasted video streams | |with bundle-only | | | | | |Offer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams)| |-------------------------------------------------------------->| | | | |Bob | |accepts | |Alice's | |offer |Answer(Audio:Opus Video:VP8 with 2 resolutions w/FEC Streams) | |<--------------------------------------------------------------| | | |One-Way Audio,Video session with 4 video streams(Simulcast | | and FEC) all multiplexed | |...............................................................| | | | | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | Nandakumar & Jennings Expires March 20, 2016 [Page 79] Internet-Draft SDP4WebRTC September 2015 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=mid:m0 | [RFC5888] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=sendonly | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:11111 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | | 100 101 103 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:64678 IN IP4 | [RFC3605] | Nandakumar & Jennings Expires March 20, 2016 [Page 80] Internet-Draft SDP4WebRTC September 2015 | 24.23.204.141 | | | a=mid:m1 | [RFC5888] Video m=line part of | | | BUNDLE group | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 1d-interleaved- | [RFC5956] | | parityfec/90000 | | | a=rtpmap:103 1d-interleaved- | [RFC5956] | | parityfec/90000 | | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 L=5; D=10; repair- | [RFC5956] | | window=200000 | | | a=fmtp:103 L=5; D=10; repair- | [RFC5956] | | window=200000 | | | a=simulcast: send 98;100 | [I-D.ietf-mmusic-sdp-simulcast | | | ] | | a=depend:98 fec m1:101 | TBD | | a=depend:100 fec m1:103 | TBD | | a=ssrc-group:FEC-FR 12345 34567 | [RFC5888] | | a=ssrc-group:FEC-FR 78990 90887 | [RFC5888] | | a=ssrc:12345 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:78990 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:34567 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=ssrc:90887 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=sendonly | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 34: 5.3.5 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS m0 | [I-D.ietf-mmusic-msid] | Nandakumar & Jennings Expires March 20, 2016 [Page 81] Internet-Draft SDP4WebRTC September 2015 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] Audio m=line part of | | | BUNDLE group with a unique | | | port number | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ssrc:33333 | [RFC5576] | | cname:Y9/cZke09JAtpl98 | | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | | : 1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx | | | raddr 192.168.1.7 rport 60065 | | | a=rtcp-rsize | [RFC5506] | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | | 98 100 101 103 | Address identical to audio | | | m=line. | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part of | | | BUNDLE group | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 1d-interleaved- | [RFC5956] | Nandakumar & Jennings Expires March 20, 2016 [Page 82] Internet-Draft SDP4WebRTC September 2015 | parityfec/90000 | | | a=rtpmap:103 1d-interleaved- | [RFC5956] | | parityfec/90000 | | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 L=5; D=10; repair- | [RFC5956] | | window=200000 | | | a=fmtp:103 L=5; D=10; repair- | [RFC5956] | | window=200000 | | | a=simulcast: recv 98;100 | [I-D.ietf-mmusic-sdp-simulcast | | | ] | | a=depend:98 fec m1:101 | TBD | | a=depend:100 fec m1:103 | TBD | | a=recvonly | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=bundle-only | [UNIFIED-PLAN] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx | | | raddr 192.168.1.7 rport 60065 | | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 35: 5.3.5 SDP Answer 5.4. Others The examples in the section provide SDP for a variety of scenarios related to RTP Header extension, Legacy Interop scenarios and more. 5.4.1. Audio Session - Voice Activity Detection This example shows Alice indicating the support of the RTP header extension to include the audio-level of the audio sample carried in the RTP packet. Nandakumar & Jennings Expires March 20, 2016 [Page 83] Internet-Draft SDP4WebRTC September 2015 2-Way Audio with VAD Alice Bob | | | | |Alice indicates support for including | |audio level in RTP header | | | | Offer(Audio:Opus,PCMU,PCMA) | |---------------------------------------->| | | | | | Answer(Audio:Opus,PCMU,PCMA) | |<----------------------------------------| | | | |Bob accepts and | |indicates his | |support as well | | | Two way Opus Audio | |.........................................| | | |Per packet audio-level is included in the| |RTP header | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | Nandakumar & Jennings Expires March 20, 2016 [Page 84] Internet-Draft SDP4WebRTC September 2015 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] | | a=rtpmap:0 PCMA/8000 | [RFC3551] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=rtcp-fb:* nack | [RFC5104] | | a=ssrc:11111 | [RFC5576] | | cname:QCL/1HmN4Xa5CClapa | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 36: 5.4.1 SDP Offer +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 98 | | | c=IN IP4 98.248.92.77 | [RFC4566] | Nandakumar & Jennings Expires March 20, 2016 [Page 85] Internet-Draft SDP4WebRTC September 2015 | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts only Opus Codec | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=rtcp-fb:* nack | [RFC5104] | | a=sendrecv | [RFC3264] - Bob can send and | | | recv audio | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing on port 49203 | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:1732846380 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 37: 5.4.1 SDP Answer 5.4.2. Audio Conference - Voice Activity Detection This example shows SDP for RTP header extension that allows RTP-level mixers in audio conferences to deliver information about the audio level of individual participants. Nandakumar & Jennings Expires March 20, 2016 [Page 86] Internet-Draft SDP4WebRTC September 2015 Audio Conference with VAD Support Alice Mixer | | |Alice indicates her interest to audio | |levels for the contributing sources | | | |Offer(Audio:Opus,PCMU,PCMA) | |---------------------------------------->| | | | | |Answer(Audio:Opus,PCMU,PCMA) | |<----------------------------------------| | | | |Mixer indicates | |it can provide | |audio-levels |Two way Opus Audio | |.........................................| | | |Audio-levels per CSRCS is included in the| |RTP header | | | +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:64678 IN IP4 | [RFC3605] | | 24.23.204.141 | | | a=extmap:1/recvonly | [RFC6465] | Nandakumar & Jennings Expires March 20, 2016 [Page 87] Internet-Draft SDP4WebRTC September 2015 | urn:ietf:params:rtp-hdrext:csrc- | | | audio-level | | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=rtcp-fb:* nack | [RFC5104] | | a=sendrecv | [RFC3264] - Alice can send and | | | recv audio | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | | 474af08a068 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx | | | raddr 192.168.1.4 rport 64678 | | | a=ssrc:11111 | [RFC5576] | | cname:QCL/1HmN4Xa5CClapa | | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 38: 5.4.2 SDP Offer Nandakumar & Jennings Expires March 20, 2016 [Page 88] Internet-Draft SDP4WebRTC September 2015 +----------------------------------+--------------------------------+ | SDP Contents | RFC#/Notes | +----------------------------------+--------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | | | gotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 98 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=extmap:1/sendonly | [RFC6465] | | urn:ietf:params:rtp-hdrext:csrc- | | | audio-level | | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=rtcp-fb:* nack | [RFC5104] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | | 7efbabd9a2 | | | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | a=ssrc:2222 cname:HmN4Xa5CC/lapa | [RFC5576] | | a=rtcp-rsize | [RFC5506] | +----------------------------------+--------------------------------+ Table 39: 5.4.2 SDP Answer Nandakumar & Jennings Expires March 20, 2016 [Page 89] Internet-Draft SDP4WebRTC September 2015 5.4.3. Successful legacy Interop Fallback with bundle-only In the scenario described below, Alice is a multi-stream capable WebRTC endpoint while Bob is a legacy VOIP end-point. The SDP Offer/ Answer exchange demonstrates successful session setup with fallback to audio only stream negotiated via bundle-only framework between the end-points. Specifically, o Offer from Alice describes 2 cameras via 2 video m=lines with both marked as bundle-only. o Since Bob doesnot recognize either the BUNDLE mechanism or the bundle-only attribute, he accepts only the audio stream from Alice. Successful 2-Way WebRTC <-> VOIP Interop Alice Bob | | | | | Alice is a multistream capable WebRTC end-point | | & Bob is behind a legacy VOIP system | | | |Offer(Audio:Opus Video:2 VP8,2 H2.64 Streams) with | | bundle-only | |---------------------------------------------------------->| | Alice marks both the video streams as bundle-only | | | | | | Answer(Audio:Opus) | |<----------------------------------------------------------| | |Bob | |accepts | |audio | |stream, | |since he | |doesn't | |recognize | |bundle-only | | | Two way Opus Audio | |...........................................................| | | | | +-------------------------------------+-----------------------------+ Nandakumar & Jennings Expires March 20, 2016 [Page 90] Internet-Draft SDP4WebRTC September 2015 | SDP Contents | RFC#/Notes | +-------------------------------------+-----------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] Alice | | | supports grouping of | | | m=lines under BUNDLE | | | semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | | | e] | | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] Audio m=line part | | | of BUNDLE group with a | | | unique port number | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (ta) | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3474 | [RFC5245] | | af08a068 | | | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | | 97:0e:1f:ef:6d:f7:c9:c7:70: | | | 9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx raddr | | | 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx raddr | | | 192.168.1.4 rport 64678 | | | a=ssrc:11111 | [RFC5576]E | Nandakumar & Jennings Expires March 20, 2016 [Page 91] Internet-Draft SDP4WebRTC September 2015 | cname:axzo1278npDlAzM73 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tb) | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=imageattr:98 [x=1280,y=720] | [RFC6236] | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=ssrc:12345 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=bundle-only | [UNIFIED-PLAN] | | a=sendrecv | [RFC3264] | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 101 103 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m2 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tc | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tc) | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=rtpmap:103 H264/90000 | [RFC3984] | | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | | ;packetization-mode=1;max-fr=30 | 1 Resolution | | a=ssrc:67890 | [RFC5576] | | cname:axzo1278npDlAzM73 | | | a=bundle-only | [UNIFIED-PLAN] | | a=sendrecv | [RFC3264] | | a=rtcp-rsize | [RFC5506] | +-------------------------------------+-----------------------------+ Table 40: 5.4.3 SDP Simulcast bundle-only +------------------------------------------+------------------------+ | SDP Contents | RFC#/Notes | +------------------------------------------+------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | Nandakumar & Jennings Expires March 20, 2016 [Page 92] Internet-Draft SDP4WebRTC September 2015 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:60065 IN IP4 24.23.204.141 | [RFC3605] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp- | | | opus] | | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | | :ssrc-audio-level | | | a=ptime:20 | [I-D.ietf-payload-rtp- | | | opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=sendrecv | [RFC3264] | | a=setup:active | [RFC4145] | | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | | a=ice- | [RFC5245] | | pwd:de4e99bd291c325921d5d47efbabd9a2 | | | a=fingerprint:sha-1 | [RFC5245] | | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7: | | | 70:9d:1f:66:79:a8:07 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx raddr | | | 192.168.1.7 rport 49203 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.7 rport 60065 | | | a=rtcp-rsize | [RFC5506] | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | | | bundle-only and hence | | | rejects the video | | | stream | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=imageattr:98 [x=1280,y=720] | [RFC6236] | | a=fmtp:98 max-fr=30 | [RFC4566] | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | | | bundle-only and hence | | | rejects the video | | | stream | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Enco | | ;packetization-mode=1;max-fr=30 | ding-1 Resolution | +------------------------------------------+------------------------+ Nandakumar & Jennings Expires March 20, 2016 [Page 93] Internet-Draft SDP4WebRTC September 2015 Table 41: 5.4.3 SDP Answer 5.4.4. Legacy Interop with RTP/AVP profile In this section, we attempt to provide session descriptions showcasing inter-operability between a WebRTC end-point and a Legacy VOIP end-point. The ideas included in here are not fully baked into the standards and might be controversial in nature. The hope here is to demonstrate a plausible SDP composition to enchance seamless inter-operability between the aforementioned communication systems. In the scenario desribed below, Alice is a legacy end-point which sends [RFC3264] Offer with two sets of media descriptions per media type. One set that correponds to [WebRTC] compliant UDP/TLS/RTP/SAVPF based audio and video descriptions. Another set with RTP/AVP based audio and video descriptions for the legacy Interop purposes. Also to note, Alice includes session level DTLS information and media level RTCP feedback information as applicable to both the sets of media descriptions On the other hand, Bob being a WebRTC end-point, recognizes accepts the media descriptions with RTP/AVP profile. The security and feedback requirements for the session are either handled by a intermediate gateway or with some combination of Alice's capabilities and the intermediate gateway. Nandakumar & Jennings Expires March 20, 2016 [Page 94] Internet-Draft SDP4WebRTC September 2015 Successful 2-Way WebRTC <-> VOIP Interop Alice Bob | | | | | Alice is a legacy VOIP End-point & Bob is a WebRTC End-Point | | | | | | | | Offer(Audio:Opus Video:H.264) | |-------------------------------------------------------------->| | | | | |Alice includes 2 copies of media descriptions | |1. WebRTC compliant media description (UDP/TLS/RTP/SAVPF) | |2. Legacy compliant media description (RTP/AVP) | | | | | | Answer(Audio:Opus, Video:H.264) | |<--------------------------------------------------------------| | |Bob | |accepts | |"legacy | |compliant" | |m=line | | | | | Two way Opus Audio, H.264 Video | |...............................................................| | Session also suports RTP/RTCP Mux, RTCP Feedback | | | +-----------------------------------------------+-------------------+ | SDP Contents | RFC#/Notes | +-----------------------------------------------+-------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 | [RFC5245] | | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:e | [RFC5245] | | f:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | | a=rtcp-rsize | [RFC5506] | | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtpmap:109 opus/48000 | | Nandakumar & Jennings Expires March 20, 2016 [Page 95] Internet-Draft SDP4WebRTC September 2015 | a=ptime:20 | | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | | 54609 typ host | | | a=candidate:1 1 UDP 694302207 24.23.204.141 | [RFC5245] | | 54609 typ srflx raddr 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 192.168.1.4 | [RFC5245] | | 64678 typ host | | | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | | 64678 typ srflx raddr 192.168.1.4 rport 64678 | | | a=rtcp-fb:109 nack | [RFC5104] | | m=video 62537 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload | | | -vp8] | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | | 62537 typ host | | | a=candidate:1 1 UDP 1694302207 24.23.204.141 | [RFC5245] | | 62537 typ srflx raddr 192.168.1.4 rport 62537 | | | a=candidate:0 2 2113667326 192.168.1.4 54721 | [RFC5245] | | typ host | | | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | | 54721 typ srflx raddr 192.168.1.4 rport 54721 | | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | --------------- | These set of | | | media | | | descriptions are | | | for Legacy Inter- | | | op purposes | | m=audio 54732 RTP/AVP 109 | [RFC4566]Alice | | | includes RTP/AVP | | | audio stream | | | description | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:7 | [RFC5245] | | f:7d:f9:c9:c7:70:9d:1f:66:79:a8:07 | | | a=rtpmap:109 opus/48000 | | | a=ptime:20 | | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761]Alice | | | still includes | | | RTP/RTCP Mux | | | support | | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | Nandakumar & Jennings Expires March 20, 2016 [Page 96] Internet-Draft SDP4WebRTC September 2015 | 54732 typ host | | | a=candidate:1 1 UDP 694302207 24.23.204.141 | [RFC5245] | | 54732 typ srflx raddr 192.168.1.4 rport 54732 | | | a=candidate:0 2 UDP 2113667326 192.168.1.4 | [RFC5245] | | 64678 typ host | | | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | | 64678 typ srflx raddr 192.168.1.4 rport 64678 | | | a=rtcp-fb:109 nack | [RFC5104]She adds | | | her intent for | | | NACK RTCP | | | feedback support | | m=video 62445 RTP/AVP 120 | [RFC4566]Alice | | | includes RTP/AVP | | | video stream | | | description | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:e | [RFC5245] | | f:7d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload | | | -vp8] | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761]Alice | | | intends to | | | perform RTP/RTCP | | | Mux | | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | | 62445 typ host | | | a=candidate:1 1 UDP 1694302207 24.23.204.141 | [RFC5245] | | 62537 typ srflx raddr 192.168.1.4 rport 62445 | | | a=candidate:0 2 2113667326 192.168.1.4 54721 | [RFC5245] | | typ host | | | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | | 54721 typ srflx raddr 192.168.1.4 rport 54721 | | | a=rtcp-fb:120 nack pli | [RFC5104] Alice | | | indicates support | | | for Picture loss | | | Indication and | | | NACK RTCP | | | feedback | | a=rtcp-fb:120 ccm fir | [RFC5104] | +-----------------------------------------------+-------------------+ Table 42: 5.4.5 SDP Offer Nandakumar & Jennings Expires March 20, 2016 [Page 97] Internet-Draft SDP4WebRTC September 2015 +-----------------------------------------------+-------------------+ | SDP Contents | RFC#/Notes | +-----------------------------------------------+-------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 | [RFC5245] | | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:e | [RFC5245] | | f:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | | m=audio 49203 RTP/AVP 109 | [RFC4566] Bob | | | accepts RTP/AVP | | | based audio | | | stream | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtpmap:109 opus/48000 | | | a=ptime:20 | | | a=sendrecv | [RFC3264] | | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245] | | 49203 typ host | | | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245] | | 49203 typ srflx raddr 192.168.1.7 rport 49203 | | | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245] | | 60065 typ host | | | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245] | | 60065 typ srflx raddr 192.168.1.7 rport 60065 | | | m=video 63130 RTP/SAVP 120 | [RFC4566] Bob | | | accepts RTP/AVP | | | based video stram | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload | | | -vp8] | | a=sendrecv | [RFC3264] | | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245] | | 63130 typ host | | | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245] | | 63130 typ srflx raddr 192.168.1.7 rport 63130 | | | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245] | | 56607 typ host | | | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245] | | 56607 typ srflx raddr 192.168.1.7 rport 56607 | | +-----------------------------------------------+-------------------+ Table 43: 5.4.5 SDP Answer Nandakumar & Jennings Expires March 20, 2016 [Page 98] Internet-Draft SDP4WebRTC September 2015 6. IANA Considerations This document requires no actions from IANA. 7. Acknowledgments We would like to thank Justin Uberti, Chris Flo for their detailed review and inputs. 8. Change Log [RFC EDITOR NOTE: Please remove this section when publishing] Changes from draft-nandakumar-rtcweb-sdp-08 o Fixed typos o Moved to a WG version Changes from draft-nandakumar-rtcweb-sdp-06 and draft-nandakumar- rtcweb-sdp-07 o Added clarification on Call-Flow diagram usage o More cleanups Changes from draft-nandakumar-rtcweb-sdp-05 o Added Ascii chart for all the SDP Eaxamples o Improved text and updated SDP Examples for Simulcast and FEC o Fixed MediaStream ID Semantics SDP Errors Changes from draft-nandakumar-rtcweb-sdp-04 o Interim version of the draft to avert expiry o Corrected placement of c= line as per RFC4566 o Updated simulcast SDP to reflect draft-westerlund-avtcore-rtp- simulcast-04 Changes from draft-nandakumar-rtcweb-sdp-03 o Aligned more closely with JSEP version -05 o Added Conventions to help readability Nandakumar & Jennings Expires March 20, 2016 [Page 99] Internet-Draft SDP4WebRTC September 2015 o Add more examples to clarify BUNDLE use-cases Changes from draft-nandakumar-rtcweb-sdp-02 o Major refactoring was done to group the examples in to categories o SDP was updated through out to reflect JSEP-04 style of defining attributes per m=line than at the session level. o Added 8 new examples. o Updated references for Trickle, Unified Plan o Add section to explain the syntax conventions followed in the examples. Changes from draft-nandakumar-rtcweb-sdp-01 o Updated references to OPUS RTP Payload Specification. o Updated BUNDLE examples based on the latest draft-ietf-mmusic-sdp- bundle-negotiation. o Added examples for multiple audio and video flows based on Unified Plan. o Added new examples for RTX and FEC streams o Updated Simulcast and SVC examples Changes from draft-nandakumar-rtcweb-sdp-00 o Fixed editorial comments on the mailing list. o Updated Data-channel SDP information based on draft-ietf-mmusic- sctp-sdp. o Updated BUNDLE examples based on draft-ietf-mmusic-sdp-bundle- negotiation. o Added examples for few more BUNDLE variants o Added new examples for Simulcast and SVC Nandakumar & Jennings Expires March 20, 2016 [Page 100] Internet-Draft SDP4WebRTC September 2015 9. Informative References [RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with Session Description Protocol (SDP)", RFC 3264, June 2002. [RFC4145] Yon, D. and G. Camarillo, "TCP-Based Media Transport in the Session Description Protocol (SDP)", RFC 4145, September 2005. [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session Description Protocol", RFC 4566, July 2006. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC5245] Rosenberg, J., "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols", RFC 5245, April 2010. [RFC5506] Johansson, I. and M. Westerlund, "Support for Reduced-Size Real-Time Transport Control Protocol (RTCP): Opportunities and Consequences", RFC 5506, April 2009. [RFC3551] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and Video Conferences with Minimal Control", STD 65, RFC 3551, July 2003. [RFC3952] Duric, A. and S. Andersen, "Real-time Transport Protocol (RTP) Payload Format for internet Low Bit Rate Codec (iLBC) Speech", RFC 3952, December 2004. [RFC4796] Hautakorpi, J. and G. Camarillo, "The Session Description Protocol (SDP) Content Attribute", RFC 4796, February 2007. [RFC5761] Perkins, C. and M. Westerlund, "Multiplexing RTP Data and Control Packets on a Single Port", RFC 5761, April 2010. [RFC3556] Casner, S., "Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth", RFC 3556, July 2003. [RFC5104] Wenger, S., Chandra, U., Westerlund, M., and B. Burman, "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)", RFC 5104, February 2008. Nandakumar & Jennings Expires March 20, 2016 [Page 101] Internet-Draft SDP4WebRTC September 2015 [RFC4588] Rey, J., Leon, D., Miyazaki, A., Varsa, V., and R. Hakenberg, "RTP Retransmission Payload Format", RFC 4588, July 2006. [RFC5956] Begen, A., "Forward Error Correction Grouping Semantics in the Session Description Protocol", RFC 5956, September 2010. [RFC5888] Camarillo, G. and H. Schulzrinne, "The Session Description Protocol (SDP) Grouping Framework", RFC 5888, June 2010. [RFC6236] Johansson, I. and K. Jung, "Negotiation of Generic Image Attributes in the Session Description Protocol (SDP)", RFC 6236, May 2011. [RFC3984] Wenger, S., Hannuksela, M., Stockhammer, T., Westerlund, M., and D. Singer, "RTP Payload Format for H.264 Video", RFC 3984, February 2005. [RFC5583] Schierl, T. and S. Wenger, "Signaling Media Decoding Dependency in the Session Description Protocol (SDP)", RFC 5583, July 2009. [RFC5576] Lennox, J., Ott, J., and T. Schierl, "Source-Specific Media Attributes in the Session Description Protocol (SDP)", RFC 5576, June 2009. [RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson, "RTP: A Transport Protocol for Real-Time Applications", STD 64, RFC 3550, July 2003. [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002. [RFC2326] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time Streaming Protocol (RTSP)", RFC 2326, April 1998. [RFC3605] Huitema, C., "Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)", RFC 3605, October 2003. [RFC2833] Schulzrinne, H. and S. Petrack, "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals", RFC 2833, May 2000. Nandakumar & Jennings Expires March 20, 2016 [Page 102] Internet-Draft SDP4WebRTC September 2015 [RFC6464] Lennox, J., Ivov, E., and E. Marocco, "A Real-time Transport Protocol (RTP) Header Extension for Client-to- Mixer Audio Level Indication", RFC 6464, December 2011. [RFC6465] Ivov, E., Marocco, E., and J. Lennox, "A Real-time Transport Protocol (RTP) Header Extension for Mixer-to- Client Audio Level Indication", RFC 6465, December 2011. [RFC7022] Begen, A., Perkins, C., Wing, D., and E. Rescorla, "Guidelines for Choosing RTP Control Protocol (RTCP) Canonical Names (CNAMEs)", RFC 7022, September 2013. [I-D.ietf-mmusic-sdp-bundle-negotiation] Holmberg, C., Alvestrand, H., and C. Jennings, "Negotiating Media Multiplexing Using the Session Description Protocol (SDP)", draft-ietf-mmusic-sdp-bundle- negotiation-12 (work in progress), October 2014. [I-D.ietf-mmusic-sdp-simulcast] Westerlund, M., Nandakumar, S., and M. Zanaty, "Using Simulcast in SDP and RTP Sessions", draft-ietf-mmusic-sdp- simulcast-00 (work in progress), January 2015. [I-D.ietf-payload-rtp-opus] Spittka, J., Vos, K., and J. Valin, "RTP Payload Format for Opus Speech and Audio Codec", draft-ietf-payload-rtp- opus-07 (work in progress), January 2015. [I-D.ietf-payload-vp8] Westin, P., Lundin, H., Glover, M., Uberti, J., and F. Galligan, "RTP Payload Format for VP8 Video", draft-ietf- payload-vp8-13 (work in progress), October 2014. [I-D.ietf-rtcweb-jsep] Uberti, J., Jennings, C., and E. Rescorla, "Javascript Session Establishment Protocol", draft-ietf-rtcweb-jsep-08 (work in progress), October 2014. [I-D.ietf-mmusic-trickle-ice] Ivov, E., Rescorla, E., and J. Uberti, "Trickle ICE: Incremental Provisioning of Candidates for the Interactive Connectivity Establishment (ICE) Protocol", draft-ietf- mmusic-trickle-ice-02 (work in progress), January 2015. [I-D.ietf-mmusic-msid] Alvestrand, H., "WebRTC MediaStream Identification in the Session Description Protocol", draft-ietf-mmusic-msid-07 (work in progress), October 2014. Nandakumar & Jennings Expires March 20, 2016 [Page 103] Internet-Draft SDP4WebRTC September 2015 [I-D.ietf-mmusic-sctp-sdp] Holmberg, C., Loreto, S., and G. Camarillo, "Stream Control Transmission Protocol (SCTP)-Based Media Transport in the Session Description Protocol (SDP)", draft-ietf- mmusic-sctp-sdp-12 (work in progress), January 2015. [I-D.ietf-rtcweb-data-channel] Jesup, R., Loreto, S., and M. Tuexen, "WebRTC Data Channels", draft-ietf-rtcweb-data-channel-13 (work in progress), January 2015. [WebRTC] W3C, "WebRTC 1.0: Real-time Communication Between Browsers", , . [UNIFIED-PLAN] Roach, A., Uberti, J., and M. Thomson, "A Unified Plan for Using SDP with Large Numbers of Media Flows", draft-roach- mmusic-unified-plan (work in progress), July 2013. Authors' Addresses Suhas Nandakumar Cisco 170 West Tasman Drive San Jose, CA 95134 USA Email: snandaku@cisco.com Cullen Jennings Cisco 170 West Tasman Drive San Jose, CA 95134 USA Phone: +1 408 421-9990 Email: fluffy@cisco.com Nandakumar & Jennings Expires March 20, 2016 [Page 104]