Network Working Group C. Boulton Internet-Draft Ubiquity Software Corporation Expires: September 9, 2006 T. Melanchuk BlankSpace S. McGlashan Hewlett-Packard A. Shiratzky Radvision March 8, 2006 A Basic Interactive Voice Response (IVR) Control Package for the Session Initiation Protocol (SIP) draft-boulton-ivr-control-package-01 Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on September 9, 2006. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document defines a Session Initiation (SIP) Control Package for basic Interactive Voice Response (IVR) interaction. The control of Boulton, et al. Expires September 9, 2006 [Page 1] Internet-Draft Media Server Control Package March 2006 Media Servers and their related resources in decomposed network architectures plays an important role in various Next Generation Networks. This Control Package provides IVR functionality using the SIP Control Framework [16]. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Conventions and Terminology . . . . . . . . . . . . . . . . . 5 3. IVR Template Dialogs . . . . . . . . . . . . . . . . . . . . . 5 3.1. Play Announcement . . . . . . . . . . . . . . . . . . . . 6 3.2. Prompt and Collect . . . . . . . . . . . . . . . . . . . . 9 3.3. Prompt and Record . . . . . . . . . . . . . . . . . . . . 15 3.4. Status Codes . . . . . . . . . . . . . . . . . . . . . . . 19 3.5. Type Definitions . . . . . . . . . . . . . . . . . . . . . 19 3.6. Sample Implementation . . . . . . . . . . . . . . . . . . 20 4. Control Package Definition . . . . . . . . . . . . . . . . . . 20 4.1. Control Package Name . . . . . . . . . . . . . . . . . . . 20 4.2. Common XML Support . . . . . . . . . . . . . . . . . . . . 21 4.3. Framework Message Usage . . . . . . . . . . . . . . . . . 21 4.4. CONTROL Message Body . . . . . . . . . . . . . . . . . . . 22 4.4.1. dialogprepare . . . . . . . . . . . . . . . . . . . . 22 4.4.2. dialogstart . . . . . . . . . . . . . . . . . . . . . 23 4.4.3. dialoguser . . . . . . . . . . . . . . . . . . . . . . 24 4.4.4. dialogterminate . . . . . . . . . . . . . . . . . . . 25 4.5. REPORT Message Body . . . . . . . . . . . . . . . . . . . 25 4.5.1. dialogprepared . . . . . . . . . . . . . . . . . . . . 25 4.5.2. dialogstarted . . . . . . . . . . . . . . . . . . . . 26 4.5.3. dialogexit . . . . . . . . . . . . . . . . . . . . . . 26 4.5.4. dialoguser . . . . . . . . . . . . . . . . . . . . . . 27 4.5.5. Error Messages . . . . . . . . . . . . . . . . . . . . 27 5. Namelist . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 6. Template Dialog Examples . . . . . . . . . . . . . . . . . . . 28 6.1. playannouncement . . . . . . . . . . . . . . . . . . . . . 29 6.2. promptandcollect . . . . . . . . . . . . . . . . . . . . . 30 6.3. promptandrecord . . . . . . . . . . . . . . . . . . . . . 31 7. AS-MS Interaction Examples . . . . . . . . . . . . . . . . . . 32 7.1. Starting an IVR dialog . . . . . . . . . . . . . . . . . . 32 7.2. IVR dialog fails to start . . . . . . . . . . . . . . . . 33 7.3. Preparing and starting an IVR dialog . . . . . . . . . . . 34 7.4. Terminating a dialog non-immediately . . . . . . . . . . . 36 7.5. Terminating a dialog immediately . . . . . . . . . . . . . 36 8. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 37 9. Security Considerations . . . . . . . . . . . . . . . . . . . 41 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 42 10.1. Control Package Registration . . . . . . . . . . . . . . . 42 10.2. MIME Registration . . . . . . . . . . . . . . . . . . . . 42 Boulton, et al. Expires September 9, 2006 [Page 2] Internet-Draft Media Server Control Package March 2006 10.3. URN Sub-Namespace Registration . . . . . . . . . . . . . . 42 11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 42 12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 42 12.1. Normative References . . . . . . . . . . . . . . . . . . . 42 12.2. Informative References . . . . . . . . . . . . . . . . . . 42 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 45 Intellectual Property and Copyright Statements . . . . . . . . . . 46 Boulton, et al. Expires September 9, 2006 [Page 3] Internet-Draft Media Server Control Package March 2006 1. Introduction The SIP Control Framework [16] provides a generic approach for establishment and reporting capabilities of remotely initiated commands. The Framework utilizes many functions provided by the Session Initiation Protocol [3] (SIP) for the rendezvous and establishment of a reliable channel for control interactions. The Control Framework also introduces the concept of a Control Package. A Control Package is an explicit usage of the Control Framework for a particular interaction set. This specification defines a package for basic IVR. The scope of the package is control of media server functions for basic interactive media (e.g. play a prompt, collecting DTMF, recording user input) as well as notifications related to these functions. These functions and notifications are defined as messages in XML [21]. The message use XML elements for preparing, starting and stopping dialogs, as well as elements for responses and notifications ([17], [19] and [20]). This basic IVR package uses template dialogs to provide IVR functionality. Three template dialogs are defined: playannouncement: a dialog to play one or more prompts to the user promptandcollect: a dialog to prompt the user and collect DTMF input promptandrecord: a dialog to prompt the user and record their audio input To use a template dialog, the AS references it by name in an XML message for preparing or starting a dialog. The XML message may also contain input parameters to configure specific dialog behavior. After the dialog has been executed, it returns template output parameters in a dialog exit message to the AS. Template dialogs are intended to provide basic IVR functionality ([11], [8], [14], [9] and [13]). The template approach follows previous approaches in that it provides IVR functionality which is commonly required for applications. It differs in that the functionality is expressed in XML using a reference to the template dialog, and parameters expressed in a simple XML data structure. This is a lightweight approach since the contents of the dialog itself does not need to be transported over the control channel (or fetched from an external source), only a template reference plus configuration data is required. From the developer's perspective, this simplifies application development: they do not need to write their IVR dialog using custom XML elements, they only need to reference the template dialog and, if required, populate a simple XML Boulton, et al. Expires September 9, 2006 [Page 4] Internet-Draft Media Server Control Package March 2006 data structure to pass configuration data. The implementation of template dialogs requires only that they adhere to the syntax and semantics of templates described in this document. Other control packages may be defined which extend the capabilities of the control package defined in this document. Such control package must respect the syntax and semantics of this control package. 2. Conventions and Terminology In this document, BCP 14/RFC 2119 [1] defines the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL". In addition, BCP 15 indicates requirement levels for compliant implementations. The following additional terms are defined for use in this document: Dialog: A dialog performs media interaction with a user. A dialog is identified by a URI and has an associated mimetype. Dialogs typically feature basic capabilities such as playing audio prompts, collecting DTMF input and recording audio input from the user. More advanced dialogs may also feature synthesized speech, recording and playback of video, recognition of spoken input, and mixed initiative conversations. Application server: A SIP [3] application server (AS) hosts and executes services such as interactive media and conferencing in an operator's network. An AS influences and impacts the SIP session, in particular by terminating SIP sessions on a media server, which is under its control. Media Server: A media server (MS) processes media streams on behalf of an AS by offering functionality such as interactive media, conferencing, and transcoding to the end user. Interactive media functionality is realized by way of dialogs, which are identified by a URI and initiated by the application server. 3. IVR Template Dialogs The execution of IVR template dialog takes place on the MS. The AS specifies the name of the template and configuration parameters, and receives the result from the MS after the dialog has been executed. Input parameters are used to configure and customize the behavior of the template. For many input parameters, the templates provide default values; a developer can specify an alternative value if the Boulton, et al. Expires September 9, 2006 [Page 5] Internet-Draft Media Server Control Package March 2006 default is not appropriate for their application. Input parameters for templates may be mandatory, requiring a specific value to be provided. The result of executing a template dialog is reported to the AS using output parameters. These parameters may describe status information, error information or information collected from the user. Output parameters are mandatory or optional depending on the specific template; mandatory parameters must be specified by the implementation. Template dialogs are invoked by referencing them in the src attribute of (Section 4.4.1) or (Section 4.4.2). Input parameters are specified in the (Section 5) of these elements. Output parameters are specified in the of (Section 4.5.3). The detailed mapping of template dialogs to XML CONTROL and REPORT messages is described in Section 4 and examples are provided in Section 6. The implementation of template dialogs requires only that they adhere to the syntax and semantics of templates described in this document. The actual implementation may be based on any technology or scripting language. Section 3.6 provides a sample implementation in VoiceXML [18]. The media requirements on the template implementation are restricted to the capability to play audio prompts (specified as URIs), collect DTMF input, and record audio input. The implementation must support G.711 audio formats. [Editors Note: Later versions may consider additional media requirements including TTS, ASR, video, etc. ] 3.1. Play Announcement A template dialog to play announcements to the user. The template dialog is invoked using the URI "playannouncement". The dialog execution model consists of: 1. Playing prompts in the order specified until completion. 2. Repeating step 1 for the value of iterations. 3. Returning status and reason parameters. The input and output parameters are summarized and defined below. Boulton, et al. Expires September 9, 2006 [Page 6] Internet-Draft Media Server Control Package March 2006 +------------+-----------+-------------------------+------------+ | Name | Direction | Description | Definition | +------------+-----------+-------------------------+------------+ | prompts | input | prompts to play | Table 2 | | iterations | input | maximum iterations | Table 3 | | status | output | status code | Table 4 | | reason | output | reason for status | Table 5 | +------------+-----------+-------------------------+------------+ Table 1: playannouncement parameter overview Note that playannouncement requires at least one prompt specified in prompts. +-------------+-----------------------------------------------------+ | Name | prompts | +-------------+-----------------------------------------------------+ | Description | One or more prompts to play | | Direction | input | | Type | URIList | | Optional | No | | Possible | A valid URIList which is non-empty | | Values | | | Default | none | +-------------+-----------------------------------------------------+ Table 2: prompts +-------------+-----------------------------------------------------+ | Name | iterations | +-------------+-----------------------------------------------------+ | Description | Maximum number of times the playannouncement dialog | | | is to be played | | Direction | input | | Type | Non-Negative Integer | | Optional | Yes | | Possible | A valid non-negative integer. A value of 0 | | Values | indicates that the dialog is repeated until halted | | | by other means. | | Default | 1 | +-------------+-----------------------------------------------------+ Table 3: iterations Boulton, et al. Expires September 9, 2006 [Page 7] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | status | +-------------+-----------------------------------------------------+ | Description | A status code indicating success or failure of the | | | playannouncement dialog | | Direction | output | | Type | Non-Negative Integer | | Optional | No | | Possible | 1 for success; otherwise an error code (600, 601, | | Values | 602). See Table 33 | | Default | none | +-------------+-----------------------------------------------------+ Table 4: status +-------------+-----------------------------------------------------+ | Name | reason | +-------------+-----------------------------------------------------+ | Description | A textual description providing a reason for the | | | status code; e.g. details about an error | | Direction | output | | Type | String | | Optional | Yes | | Possible | A valid String value | | Values | | | Default | Empty string | +-------------+-----------------------------------------------------+ Table 5: reason The following additional input parameters are under consideration for later versions: +---------------+---------------------------------------------------+ | Name | Description | +---------------+---------------------------------------------------+ | duration | maximum duration for the dialog including | | | iterations | | interval | time to elapse between successive iterations | | audiomaxage | maxage cache control for prompts | | audiomaxstale | maxstale cache control for prompts | | speed | playback speed for prompts | | volume | playback volume for prompts | | offset | play from offset in prompts | | variables | references to common types such as money, time, | | | numbers, etc | +---------------+---------------------------------------------------+ Boulton, et al. Expires September 9, 2006 [Page 8] Internet-Draft Media Server Control Package March 2006 Table 6: Additional playannouncement parameters 3.2. Prompt and Collect A template dialog to play prompts and collect DTMF input. The dialog is invoked with the URI "promptandcollect". The dialog execution model consists of: 1. Clearing the digit buffer depending on the value of cleardigitbuffer. 2. Playing prompts in the order specified. The bargein parameter determines whether user input can be collected during prompt playback stops (if so, prompt playback is stopped). 3. Collecting DTMF input from the user. Valid DTMF patterns are either a simple digit string where the maximum length is determined by maxdigits and may be terminated by the character in termchar; or a custom DTMF grammar specified by grammar. The parameters timeout, interdigittimeout and termtimeout control user input timeout, interdigit timeout and the terminating timeout respectively. 4. If no input is collected or the input is invalid, steps 1 - 3 are repeated for the value of iterations. 5. Returning status, reason and result parameters. The input and output parameter are summarized and defined below. +-------------------+-----------+----------------------+------------+ | Name | Direction | Description | Definition | +-------------------+-----------+----------------------+------------+ | prompts | input | prompts to play | Table 8 | | iterations | input | maximum attempts | Table 9 | | cleardigitbuffer | input | dtmf buffer clearing | Table 10 | | bargein | input | interruption of | Table 11 | | | | prompts | | | timeout | input | timeout for user | Table 12 | | | | input | | | interdigittimeout | input | timeout between | Table 13 | | | | digits | | | termtimeout | input | terminating timeout | Table 14 | | termchar | input | terminating | Table 15 | | | | character | | | maxdigits | input | maximum number of | Table 16 | | | | digits | | | grammar | input | custom grammar | Table 17 | | status | output | status code | Table 18 | | reason | output | reason for status | Table 19 | Boulton, et al. Expires September 9, 2006 [Page 9] Internet-Draft Media Server Control Package March 2006 | result | output | input collected | Table 20 | +-------------------+-----------+----------------------+------------+ +-------------+-----------------------------------------------------+ | Name | prompts | +-------------+-----------------------------------------------------+ | Description | Initial prompts to play | | Direction | input | | Type | URIList | | Optional | Yes | | Possible | A valid URIList | | Values | | | Default | none | +-------------+-----------------------------------------------------+ Table 8: prompts +-------------+-----------------------------------------------------+ | Name | iterations | +-------------+-----------------------------------------------------+ | Description | Maximum number of times the promptandcollect dialog | | | is to be played | | Direction | input | | Type | Non-Negative Integer | | Optional | Yes | | Possible | A valid non-negative integer. A value of 0 | | Values | indicates the dialog is repeated until halted by | | | other means. | | Default | 0 | +-------------+-----------------------------------------------------+ Table 9: iterations +-------------+-----------------------------------------------------+ | Name | cleardigitbuffer | +-------------+-----------------------------------------------------+ | Description | Clear digit buffer prior to prompt playback | | Direction | input | | Type | Boolean | | Optional | Yes | | Possible | A valid boolean value. A value of true indicates | | Values | that the digitbuffer is to be cleared. A value of | | | false indicates that the digitbuffer is not to be | | | cleared. | | Default | true | +-------------+-----------------------------------------------------+ Table 10: cleardigitbuffer Boulton, et al. Expires September 9, 2006 [Page 10] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | bargein | +-------------+-----------------------------------------------------+ | Description | Indicates whether the user can interrupt the prompt | | | with their input | | Direction | input | | Type | Boolean | | Optional | Yes | | Possible | A valid boolean value. A value of true indicates | | Values | that bargein is permitted. A value of false | | | indicates that bargein is not permitted. | | Default | true | +-------------+-----------------------------------------------------+ Table 11: bargein +-------------+-----------------------------------------------------+ | Name | timeout | +-------------+-----------------------------------------------------+ | Description | Indicates the time to wait for user input | | Direction | input | | Type | Time Designation | | Optional | Yes | | Possible | A valid TimeDesignation value. | | Values | | | Default | 5s | +-------------+-----------------------------------------------------+ Table 12: timeout +-------------+-----------------------------------------------------+ | Name | interdigittimeout | +-------------+-----------------------------------------------------+ | Description | The inter-digit timeout value to use when | | | recognizing DTMF input | | Direction | input | | Type | Time Designation | | Optional | Yes | | Possible | A valid TimeDesignation value. | | Values | | | Default | 2s | +-------------+-----------------------------------------------------+ Table 13: interdigittimeout Boulton, et al. Expires September 9, 2006 [Page 11] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | termtimeout | +-------------+-----------------------------------------------------+ | Description | The terminating timeout to use when recognizing | | | DTMF input | | Direction | input | | Type | Time Designation | | Optional | Yes | | Possible | A valid TimeDesignation value. | | Values | | | Default | 0s | +-------------+-----------------------------------------------------+ Table 14: termtimeout +-------------+-----------------------------------------------------+ | Name | termchar | +-------------+-----------------------------------------------------+ | Description | The terminating DTMF character for DTMF input | | | recognition. This parameter is ignored if the | | | grammar parameter is specified. | | Direction | input | | Type | DTMFChar | | Optional | Yes | | Possible | A valid DTMFChar value. To disable termination by | | Values | a conventional DTMF character, set the parameter to | | | an unconventional character like 'A'. | | Default | # | +-------------+-----------------------------------------------------+ Table 15: termchar +-------------+-----------------------------------------------------+ | Name | maxdigits | +-------------+-----------------------------------------------------+ | Description | The maximum number of digits to collect using an | | | internal digits (0-9 only) grammar. This parameter | | | is ignored if the grammar parameter is specified. | | Direction | input | | Type | Positive Integer | | Optional | Yes | | Possible | A valid positive integer value. | | Values | | | Default | 5 | +-------------+-----------------------------------------------------+ Table 16: maxdigits Boulton, et al. Expires September 9, 2006 [Page 12] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | grammar | +-------------+-----------------------------------------------------+ | Description | A URI reference to a custom DTMF grammar. If this | | | parameter is specified, then the referenced DTMF | | | grammar is used instead of the internal digits | | | grammar (i.e. maxdigits and termchar are ignored | | | even if specified). Custom grammars permit the | | | full range of DTMF characters including '*' and '#' | | | to be specified for DTMF pattern matching. | | Direction | input | | Type | URI | | Optional | Yes | | Possible | A valid URI value referencing a valid custom DTMF | | Values | grammar. | | Default | none | +-------------+-----------------------------------------------------+ Table 17: grammar [Editors note: The format of the custom DTMF grammar is not yet defined. Possibilities include: [15], [10], and [12]. If more than one format is permitted, then an additional input parameter "grammartype" would indicate the format used in the grammar parameter.] +-------------+-----------------------------------------------------+ | Name | status | +-------------+-----------------------------------------------------+ | Description | A status code indicating success or failure of the | | | promptandcollect dialog | | Direction | output | | Type | Non-Negative Integer | | Optional | No | | Possible | 1 for success; otherwise an error code (600, 601, | | Values | 603). See Table 33 | | Default | none | +-------------+-----------------------------------------------------+ Table 18: status Boulton, et al. Expires September 9, 2006 [Page 13] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | reason | +-------------+-----------------------------------------------------+ | Description | A textual description providing a reason for the | | | status code; e.g. details on an error | | Direction | output | | Type | String | | Optional | Yes | | Possible | A valid String value | | Values | | | Default | Empty string | +-------------+-----------------------------------------------------+ Table 19: reason +-------------+-----------------------------------------------------+ | Name | result | +-------------+-----------------------------------------------------+ | Description | The DTMF input collected from the user. | | Direction | output | | Type | DTMFString | | Optional | The parameter is mandatory if status is 1; | | | otherwise, optional. | | Possible | A valid DTMFString (no spaces between characters). | | Values | | | Default | Empty String | +-------------+-----------------------------------------------------+ Table 20: result In addition to the prompt extensions described in Table 6, the following parameters are under consideration for later versions: +--------------------+----------------------------------------------+ | Name | Description | +--------------------+----------------------------------------------+ | nomatchprompts | prompts to play when input doesn't match the | | | DTMF grammar | | noinputprompts | prompts to play when there is no user input | | successprompts | prompts to play when user input is collected | | failureprompts | prompts to play when no valid user input has | | | been collected after all iterations tried | | escapechar | character which causes the dialog to restart | | | without incrementing the iterations counter | | iterationcount | number of iterations (output) | | promptplayedamount | duration of initial prompts played if prompt | | | interrupted (output) | +--------------------+----------------------------------------------+ Boulton, et al. Expires September 9, 2006 [Page 14] Internet-Draft Media Server Control Package March 2006 3.3. Prompt and Record A template dialog to prompt the user and record their audio input. The dialog is invoked with the URI "promptandrecord". The dialog execution model consists of: 1. Playing prompts in the order specified until completion. 2. Recording audio input from the user. Recording is initiated if user input is received before timeout expires. The recording is terminated by DTMF input, the maximum duration being exceeded or a final silence after recording, as specified in dtmfterm, maxtime and finalsilence parameters respectively. 3. If recording is not initiated, steps 1 - 2 are repeated for the value of iterations. 4. Returning status, reason and result parameters. The input and output parameter are summarized and defined below. +--------------+-----------+---------------------------+------------+ | Name | Direction | Description | Definition | +--------------+-----------+---------------------------+------------+ | prompts | input | prompts to play | Table 23 | | iterations | input | maximum attempts | Table 24 | | timeout | input | timeout to wait for input | Table 25 | | dtmf | input | recording terminated by | Table 26 | | | | DTMF | | | maxtime | input | maximum duration of | Table 27 | | | | recording | | | finalsilence | input | final silence to | Table 28 | | | | terminate recording | | | status | output | status code | Table 29 | | reason | output | reason for status | Table 30 | | result | output | URI for recording | Table 31 | +--------------+-----------+---------------------------+------------+ +-------------+-----------------------------------------------------+ | Name | prompts | +-------------+-----------------------------------------------------+ | Description | Initial prompts to play | | Direction | input | | Type | URIList | | Optional | Yes | | Possible | A valid URIList | | Values | | | Default | none | +-------------+-----------------------------------------------------+ Boulton, et al. Expires September 9, 2006 [Page 15] Internet-Draft Media Server Control Package March 2006 Table 23: prompts +-------------+-----------------------------------------------------+ | Name | iterations | +-------------+-----------------------------------------------------+ | Description | Maximum number of times the promptandrecord dialog | | | is to be played | | Direction | input | | Type | Non-Negative Integer | | Optional | Yes | | Possible | A valid non-negative integer. A value of 0 | | Values | indicates that the dialog is repeated until halted | | | by other means. | | Default | 0 | +-------------+-----------------------------------------------------+ Table 24: iterations +-------------+-----------------------------------------------------+ | Name | timeout | +-------------+-----------------------------------------------------+ | Description | Indicates the time to wait for user input. | | Direction | input | | Type | Time Designation | | Optional | Yes | | Possible | A valid TimeDesignation value. | | Values | | | Default | 5s | +-------------+-----------------------------------------------------+ Table 25: timeout +-------------+-----------------------------------------------------+ | Name | dtmfterm | +-------------+-----------------------------------------------------+ | Description | Indicates whether recording can be terminated by | | | DTMF input | | Direction | input | | Type | Boolean | | Optional | Yes | | Possible | A valid Boolean value. A value of true indicates | | Values | that recording can be terminated by DTMF. A value | | | of false indicates that recording cannot be | | | terminated by DTMF. | | Default | true | +-------------+-----------------------------------------------------+ Table 26: dtmfterm Boulton, et al. Expires September 9, 2006 [Page 16] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | maxtime | +-------------+-----------------------------------------------------+ | Description | The maximum duration of the recording | | Direction | input | | Type | Time Designation | | Optional | Yes | | Possible | A valid TimeDesignation value. | | Values | | | Default | 15s | +-------------+-----------------------------------------------------+ Table 27: maxtime +-------------+-----------------------------------------------------+ | Name | finalsilence | +-------------+-----------------------------------------------------+ | Description | The interval of silence that indicates end of | | | speech | | Direction | input | | Type | Time Designation | | Optional | Yes | | Possible | A valid TimeDesignation value. | | Values | | | Default | 5s | +-------------+-----------------------------------------------------+ Table 28: finalsilence +-------------+-----------------------------------------------------+ | Name | status | +-------------+-----------------------------------------------------+ | Description | A status code indicating success or failure of the | | | promptandrecord dialog | | Direction | output | | Type | Non-Negative Integer | | Optional | No | | Possible | 1 for success; otherwise an error code (600, 601, | | Values | 603). See Table 33 | | Default | none | +-------------+-----------------------------------------------------+ Table 29: status Boulton, et al. Expires September 9, 2006 [Page 17] Internet-Draft Media Server Control Package March 2006 +-------------+-----------------------------------------------------+ | Name | reason | +-------------+-----------------------------------------------------+ | Description | A textual description providing a reason for the | | | status code; e.g. details on an error | | Direction | output | | Type | String | | Optional | Yes | | Possible | A valid String value | | Values | | | Default | Empty string | +-------------+-----------------------------------------------------+ Table 30: reason +-------------+-----------------------------------------------------+ | Name | result | +-------------+-----------------------------------------------------+ | Description | A URI referencing the media recording | | Direction | output | | Type | URI | | Optional | The parameter is mandatory if status is 1; | | | otherwise, optional. | | Possible | A valid URI value | | Values | | | Default | Empty string | +-------------+-----------------------------------------------------+ Table 31: result In addition to the prompt extensions described in Table 6, the following additional parameters are under consideration for a later version. +--------------------+----------------------------------------------+ | Name | Description | +--------------------+----------------------------------------------+ | destination | URI to send recording using HTTP | | mimetype | mimetype to use for recording (including | | | media and file formats) | | beep | indicates whether a platform-specific beep | | | is used immediately prior to recording | | noinputprompts | prompts to play when there is no user input | | successprompts | prompts to play when recording is successful | | failureprompts | prompts to play when no recording has been | | | made after all the iterations tried | | duration | duration of the recording (output) | | mimetype | mimetype of the recording (output) | Boulton, et al. Expires September 9, 2006 [Page 18] Internet-Draft Media Server Control Package March 2006 | iterationcount | number of iterations (output) | | terminationmode | indication of why recording terminated: | | | dtmf, maxtime reached, externalevent or | | | finalsilence detected (output) | | promptplayedamount | duration of initial prompts played if prompt | | | interrupted (output) | +--------------------+----------------------------------------------+ 3.4. Status Codes The following table describes the codes returned in the status output parameter for template dialogs. +-----------+-------------------------------------------------------+ | status | description | +-----------+-------------------------------------------------------+ | 1 | success | | 600 | unspecified error | | 601 | invalid input parameter | | 602 | no prompts defined (only playannouncement) | | 603 | maximum iterations reached without valid input (not | | | playannouncement) | +-----------+-------------------------------------------------------+ Table 33: status codes for all templates dialogs 3.5. Type Definitions This section defines types referenced in template parameters. 3.5.1. Boolean The value space of boolean is the set {true, false}. 3.5.2. DTMFChar A DTMF character. The value space is the set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, #, *, A, B, C, D}. 3.5.3. DTMFString A String composed of one or more DTMFChars. 3.5.4. Non-Negative Integer The value space of non-negative integer is the infinite set {0,1,2,...}. Boulton, et al. Expires September 9, 2006 [Page 19] Internet-Draft Media Server Control Package March 2006 3.5.5. Positive Integer The value space of positive integer is the infinite set {1,2,...}. 3.5.6. String A string in the character encoding associated with the XML element. 3.5.7. Time Designation A time designation consists of a non-negative real number followed by a time unit identifier. The time unit identifiers are: "ms" (milliseconds) and "s" (seconds). Examples include: "3s", "850ms", "0.7s", ".5s" and "+1.5s". 3.5.8. URI Uniform Resource Indicator as defined in [7]. 3.5.9. URIList A list of URIs. 3.6. Sample Implementation TODO 4. Control Package Definition This section fulfills the mandatory requirement for information that MUST be specified during the definition of a Control Framework Package, as detailed in Section 8 of [16]. 4.1. Control Package Name The Control Framework requires a Control Package definition to specify and register a unique name. The name of this Control Package is "msc-ivr-basic" (Media Server Control - Interactive Voice Response - Basic). This value appears in the 'Control-Packages' SIP header that is present in the INVITE dialog request that creates the control channel, as specified in [16]. Boulton, et al. Expires September 9, 2006 [Page 20] Internet-Draft Media Server Control Package March 2006 4.2. Common XML Support The Control Framework requires a Control Package definition to specify if the attributes for media dialog or conference references are required. This package requires that the XML Schema in Section 12.1 of [16] MUST be supported. 4.3. Framework Message Usage IVR functionality includes capabilities such as playing prompts, collecting DTMF and recording user input. These functions are expressed in template dialogs (Section 3). The AS can send the following CONTROL messages to the MS: : prepare a dialog for later execution : execute a dialog (as defined or previously prepared) : send a user-defined message to an active dialog : terminate a dialog (prepared or started) The MS response is specified in responses and/or REPORT messages. The precise response is depend on the IVR dialog state, and the contents of the control message. If an XML message is not well- formed or invalid according to the schema in Section 8, then 4XX response is generated. For the command, the response is a (terminate) REPORT with message (if the dialog was prepared successfully) or with message (if there was an error preparing the dialog). For the command, the response is an (update) REPORT with message (if the dialog was started successfully), then zero or more (update) REPORT messages (reporting information gathered during the dialog) and finally a (terminate) REPORT with a message. If the dialog does not start, the response is a (terminate) REPORT with a message. For the command, the response is 200 if the message is understood. For the command, the response is 200 if the command is understood. The MS can send following CONTROL message to the AS: Boulton, et al. Expires September 9, 2006 [Page 21] Internet-Draft Media Server Control Package March 2006 : send a user-defined message from an active dialog The AS responds with a 200 response if the message was understood. 4.4. CONTROL Message Body A valid CONTROL body message MUST conform to the schema defined in Section 8. 4.4.1. dialogprepare The request is sent from the AS to the MS to request preparation of an IVR dialog. A prepared dialog is executed when the AS sends a request referencing the prepared dialog (see Section 4.4.2). A element has the following attributes: src: string identifying the URI of the dialog document to prepare. The attribute is mandatory. The MS MUST support playannouncement, promptandcollect and promptandrecord template dialogs as the value for this attribute. type: string identifying the MIME type of the document. The default value is "application/ivrtemplate+xml". The attribute is optional. The element has the following child elements: : an XML data structure (see Section 5) to pass parameters into the dialog. The element is optional. : contains a list of one or more elements where each item element has mandatory name and value attributes. The element is optional. The AS uses this element to subscribe to events generated by the MS. Notifications of dialog events are delivered using a REPORT (see Section 4.4.3). If the MS does not support a specific event notification to which the AS subscribes, then the MS MUST ignore the individual . This protocol does not require the MS to support any specific event notifications, but the MS MAY support notification events such as "dtmf" (indicating that a DTMF key has been pressed), or "tone" (indicating that a tone has been detected), "audiostart" (audio playback has started), "bargein" (user has barged in), "mark" (a mark has been encountered in the output stream), "goto" (dialog has transitioned to another location), and so forth. For example, a request to prepare a playannouncement dialog where a single prompt once: Boulton, et al. Expires September 9, 2006 [Page 22] Internet-Draft Media Server Control Package March 2006 When an MS has received a request, it MUST reply with a or REPORT message. 4.4.2. dialogstart The element is sent by the AS to request execution of a dialog. The dialog may be defined in the dialogstart request itself, or reference a previously prepared dialog. The element has the following attributes: src: string identifying the URI of the dialog document to start. The attribute is optional. The MS MUST support playannouncement, promptandcollect and promptandrecord template dialogs as the value for this attribute. type: string identifying the MIME type of the document. The default value is "application/ivrtemplate+xml". The attribute is optional. prepareddialogid: string identifying a dialog previously prepared using a dialogprepare request. The attribute is optional. connection-id: string identifying the SIP dialog connection on which this dialog is to be started (see Section 12.1 of [16]). The attribute is optional. conf-id: string identifying the conference on which this dialog is to be started (see Section 12.1 of [16]). The attribute is optional. If the prepareddialogid is specified, it is an error to specify the src attribute or the type attribute. Exactly one of the connection-id or conf-id attributes MUST be specified. It is an error to specify both connection-id and conf-id. The element has the following child elements defined: : an XML data structure (see Section 5) to pass parameters into the dialog. The element is optional. : contains a list of one or more elements where each item element has mandatory name and value attributes. The element is optional. Boulton, et al. Expires September 9, 2006 [Page 23] Internet-Draft Media Server Control Package March 2006 The AS uses this element to subscribe to events generated by the MS. Notifications of dialog events are delivered using REPORT (see Section 4.4.3). If the MS does not support a specific event notification to which the AS subscribes, then the MS MUST ignore the individual . This protocol does not require the MS to support any specific event notifications, but the MS MAY support notification events such as "dtmf" (indicating that a DTMF key has been pressed), or "tone" (indicating that a tone has been detected), "audiostart" (audio playback has started), "bargein" (user has barged in), "mark" (a mark has been encountered in the output stream), "goto" (dialog has transitioned to another location), and so forth. If the prepareddialogid is specified and the contained a element, it is an error to specify it in . Likewise, If the prepareddialogid is specified and the contained a element, it is an error to specify it in . For example, a request to start a promptandrecord template dialog on a conference: When an MS has received a request, it MUST reply with a or REPORT message. 4.4.3. dialoguser During execution of a dialog, a CONTROL can be used to pass asynchronous, user-defined events from the AS to the MS, or vice versa from the MS to the AS. The MS is not required to support receiving or sending asynchronous events. If it does not support receiving asynchronous events, a 4XX response will be returned instead of 200. The element has the following attributes: name: string indicating the name of event. The string is restricted to a sequence of alphanumeric or "." characters. The attribute is mandatory. Boulton, et al. Expires September 9, 2006 [Page 24] Internet-Draft Media Server Control Package March 2006 dialogid: string identifying the dialog. The attribute is mandatory. A element has the following child element: : an XML data structure (see Section 5) to pass information from the AS to the dialog. The element is optional. For example, the AS sends the MS information which may be announced to the user in the dialog identified as "vxi1": 4.4.4. dialogterminate A dialog that has been prepared or has been started can be terminated by a request element from the AS. The element has the following attributes: dialogid: string identifying the dialog. The attribute is mandatory. immediate: string with the values "true" or "false" indicating whether the dialog is to be terminated immediately or not. The default is "false". The attribute is optional. For example, assuming a dialog with the dialogid "vxi1" has been started, it can be terminated immediately with the following request: The request causes execution of the dialog to be terminated. If the request is for immediate termination, then the MS sends a 200 response. If the request is for non-immediate termination, then the MS send a REPORT (or a failure message). 4.5. REPORT Message Body A valid REPORT body MUST conform to the schema defined in Section 8. 4.5.1. dialogprepared The element has following attributes: Boulton, et al. Expires September 9, 2006 [Page 25] Internet-Draft Media Server Control Package March 2006 dialogid: string identifying the dialog. The MS assigns a globally unique identifier for this dialog and reuses it in subsequent references to the dialog; for example, as the prepareddialogid in and in dialog notifications. The attribute is mandatory. For example, a response when the dialog was prepared successfully: 4.5.2. dialogstarted The element has the following attributes: dialogid: string identifying the dialog. If prepareddialogid is specified in the request, then dialogid MUST have the same value. If prepareddialogid is not specified, then the MS assigns a globally unique identifier for this dialog and reuses it in subsequent references to the dialog; for example, in dialog notifications. The attribute is mandatory. [Editors Note: do we want to allow dialog names to be defined by the AS?] For example, a response when the dialog was started successfully. 4.5.3. dialogexit The element has the following attributes: dialogid: string identifying the dialog. The attribute is mandatory. The element has the following child element: : an XML data structure (see Section 5) to pass information from the dialog to the AS. The element is optional. For example, the dialog exits without data being returned: The dialog exits and data is returned to the AS: Boulton, et al. Expires September 9, 2006 [Page 26] Internet-Draft Media Server Control Package March 2006 4.5.4. dialoguser The element in a REPORT message can provide asychronous user-defined information to the MS during execution of a dialog. The element has the following attributes: name: string indicating the name of event. The string is restricted to a sequence of alphanumeric or "." characters. The attribute is mandatory. dialogid: string identifying the dialog. The attribute is mandatory. A element has the following child element: : an XML data structure (see Section 5) to pass information from the AS to the dialog. The element is optional. For example, the MS sends the AS a midcall update on data collected so far: [Editors note: Since is available as a CONTROL message, it may not be necessary as REPORT message.] 4.5.5. Error Messages [Editors Note: These message may be restructured as a general error element with a type attribute (e.g. type="dialognotprepared").] The element has following attributes: dialogid: string identifying the dialog. The attribute is mandatory. reason: string specifying the reason why dialog preparation failed. The attribute is optional. For example, a response when dialog preparation failed due to an unknown template: The element has the following attributes: Boulton, et al. Expires September 9, 2006 [Page 27] Internet-Draft Media Server Control Package March 2006 dialogid: string identifying the dialog. The attribute is mandatory. reason: string specifying the reason why the dialog failed to start. The attribute is optional. For example, a response when dialog failed to start due to an unknown template dialog reference: 5. Namelist The element is a container for parameter data. Each parameter is specified using a top-level element. The name of the parameter is specified in a "name" attribute with a non- empty string value. A simple value for a parameter is specified using a "value" attribute with a string value. For example: Multiple value parameters, such as a list of prompt URIs, can be specified using space separation. For example: [Editors Note: we may also want to investigate the use of s nested within a top-level to specify complex values. ] 6. Template Dialog Examples The following examples show how playannouncement, promptandcollect and promptandrecord template dialogs are used with , and elements. The examples do not specify all messages between the AS and MS. Boulton, et al. Expires September 9, 2006 [Page 28] Internet-Draft Media Server Control Package March 2006 6.1. playannouncement This example prepares an announcement composed of two prompts. If the dialog is prepared successfully, a dialogprepared message is returned: The prepared dialog is then started on a conference playing the prompts twice: In the case of a successful dialog, the output is provided in ; for example In this example, the dialog is started on a sip dialog connection, but no is specified: Boulton, et al. Expires September 9, 2006 [Page 29] Internet-Draft Media Server Control Package March 2006 and an error message is returned: 6.2. promptandcollect This example plays no prompts and just waits for input from the user: If the dialog is successful, then contains the dtmf collected in its result parameter: In this example, a prompt is played and then we wait for 3 hours for a two digit sequence: If no user input is collected within 3 hours, then following would be Boulton, et al. Expires September 9, 2006 [Page 30] Internet-Draft Media Server Control Package March 2006 returned: And finally in this example, one of the input parameters is invalid: The error is reported in the : 6.3. promptandrecord In this example, the user is prompted, then their input is recorded for a maximum of 30 seconds. Boulton, et al. Expires September 9, 2006 [Page 31] Internet-Draft Media Server Control Package March 2006 If successful, the following is returned in : 7. AS-MS Interaction Examples The following example assume a control channel has been established as described in the SIP Control Framework [16]. The XML messages are in angled brackets; the REPORT status is in round brackets. Other aspects of the protocol are omitted for readability. 7.1. Starting an IVR dialog An IVR dialog is started successfully, a single dialoguser notification report is send from the MS to the AS and then the dialog exits normally. Boulton, et al. Expires September 9, 2006 [Page 32] Internet-Draft Media Server Control Package March 2006 Application Server (AS) Media Server (MS) | | | (1) CONTROL: | | ----------------------------------------> | | | | (2) 202 | | <--------------------------------------- | | | | (3) REPORT: (pending) | | <---------------------------------------- | | | | (4) 200 | | ----------------------------------------> | | | | (5) REPORT: (update) | | <---------------------------------------- | | | | (6) 200 | | ----------------------------------------> | | | | (7) REPORT: (update) | | <---------------------------------------- | | | | (8) 200 | | ----------------------------------------> | | | | (9) REPORT: (terminate) | | <---------------------------------------- | | | | (10) 200 | | ----------------------------------------> | | | 7.2. IVR dialog fails to start An IVR dialog fails to start. Boulton, et al. Expires September 9, 2006 [Page 33] Internet-Draft Media Server Control Package March 2006 Application Server (AS) Media Server (MS) | | | (1) CONTROL: | | ----------------------------------------> | | | | (2) 202 | | <--------------------------------------- | | | | (3) REPORT: (pending) | | <---------------------------------------- | | | | (4) 200 | | ----------------------------------------> | | | | (5) REPORT: | | (terminate) | | <---------------------------------------- | | | | (6) 200 | | ----------------------------------------> | | | 7.3. Preparing and starting an IVR dialog An IVR dialog is prepared and started successfully, and then the dialog exits normally. Boulton, et al. Expires September 9, 2006 [Page 34] Internet-Draft Media Server Control Package March 2006 Application Server (AS) Media Server (MS) | | | (1) CONTROL: | | ----------------------------------------> | | | | (2) 202 | | <--------------------------------------- | | | | (3) REPORT: (pending) | | <---------------------------------------- | | | | (4) 200 | | ----------------------------------------> | | | | (5) REPORT: | | (terminate) | | <---------------------------------------- | | | | (6) 200 | | ----------------------------------------> | | | | (7) CONTROL: | | ----------------------------------------> | | | | (8) 202 | | <--------------------------------------- | | | | (9) REPORT: (pending) | | <---------------------------------------- | | | | (10) 200 | | ---------------------------------------> | | | | (11) REPORT: (update) | | <---------------------------------------- | | | | (12) 200 | | ----------------------------------------> | | | | (13) REPORT: (terminate) | | <---------------------------------------- | | | | (14) 200 | | ----------------------------------------> | | | Boulton, et al. Expires September 9, 2006 [Page 35] Internet-Draft Media Server Control Package March 2006 7.4. Terminating a dialog non-immediately An IVR dialog is started successfully, and then terminated non- immediately by the AS, allowing the MS to send a dialogexit with information collected during the dialog before termination. Application Server (AS) Media Server (MS) | | | (1) CONTROL: | | ----------------------------------------> | | | | (2) 202 | | <--------------------------------------- | | | | (3) REPORT: (pending) | | <---------------------------------------- | | | | (4) 200 | | ----------------------------------------> | | | | (5) REPORT: (update) | | <---------------------------------------- | | | | (6) 200 | | ----------------------------------------> | | | | (7) CONTROL: | | ----------------------------------------> | | | | (8) 200 | | <---------------------------------------- | | | | (9) REPORT: (terminate) | | <---------------------------------------- | | | | (10) 200 | | ----------------------------------------> | | | 7.5. Terminating a dialog immediately An IVR dialog is started successfully, and then terminated immediately by the AS. Boulton, et al. Expires September 9, 2006 [Page 36] Internet-Draft Media Server Control Package March 2006 Application Server (AS) Media Server (MS) | | | (1) CONTROL: | | ----------------------------------------> | | | | (2) 202 | | <--------------------------------------- | | | | (3) REPORT: (pending) | | <---------------------------------------- | | | | (4) 200 | | ----------------------------------------> | | | | (5) REPORT: (update) | | <---------------------------------------- | | | | (6) 200 | | ----------------------------------------> | | | | (7) CONTROL: | | ----------------------------------------> | | | | (8) 200 | | <---------------------------------------- | | | | (9) REPORT: (terminate) | | <---------------------------------------- | | | | (10) 200 | | ----------------------------------------> | | | 8. Formal Syntax [Editors note: A later version of the XML schema will provide more constraints as expressed in the textual definitions; for example, single occurrence of elements, co-occurence on attributes, etc.] Boulton, et al. Expires September 9, 2006 [Page 37] Internet-Draft Media Server Control Package March 2006 Basic IVR 1.0 schema (20060308) Boulton, et al. Expires September 9, 2006 [Page 38] Internet-Draft Media Server Control Package March 2006 Boulton, et al. Expires September 9, 2006 [Page 39] Internet-Draft Media Server Control Package March 2006 Boulton, et al. Expires September 9, 2006 [Page 40] Internet-Draft Media Server Control Package March 2006 9. Security Considerations Security Considerations to be included in later versions of this document. Boulton, et al. Expires September 9, 2006 [Page 41] Internet-Draft Media Server Control Package March 2006 10. IANA Considerations This document registers a new SIP Control Framework Package, a new MIME type, and a new XML namespace. 10.1. Control Package Registration Control Package name: msc-ivr-basic 10.2. MIME Registration TODO: application/ivrtemplate+xml 10.3. URN Sub-Namespace Registration TODO: urn:ietf:params:xml:ns:msc-ivr-basic 11. Acknowledgments The authors would like to thank Adnan Saleem of Convedia and Gene Shtirmer of Intel for useful review of this work. 12. References 12.1. Normative References [1] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 12.2. Informative References [2] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999. [3] 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. [4] Rosenberg, J. and H. Schulzrinne, "Reliability of Provisional Responses in Session Initiation Protocol (SIP)", RFC 3262, June 2002. [5] Rosenberg, J. and H. Schulzrinne, "Session Initiation Protocol (SIP): Locating SIP Servers", RFC 3263, June 2002. Boulton, et al. Expires September 9, 2006 [Page 42] Internet-Draft Media Server Control Package March 2006 [6] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with Session Description Protocol (SDP)", RFC 3264, June 2002. [7] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifiers (URI): Generic Syntax", RFC 2396, August 1998. [8] Burger, E., Van Dyke, J., and A. Spitzer, "Basic Network Media Services with SIP", RFC 4240, December 2005. [9] Cromwell, D., "Proposal for an MGCP Advanced Audio Package", RFC 2897, August 2000. [10] "Gateway control protocol: Version 3", ITU-T Recommendation H.248.1. [11] "Gateway control protocol: Advanced media server packages", ITU-T Recommendation H.248.9. [12] Burger, E. and M. Dolly, "A Session Initiation Protocol (SIP) Event Package for Key Press Stimulus (KPML)", draft-ietf-sipping-kpml-07 (work in progress), December 2004. [13] Van Dyke, J., Burger, E., and A. Spitzer, "Media Server Control Markup Language (MSCML) and Protocol", draft-vandyke-mscml-06 (work in progress), December 2004. [14] Saleem, A. and G. Sharratt, "Media Objects Markup Language (MOML)", draft-melanchuk-sipping-moml-06 (work in progress), October 2005. [15] Hunt, A. and S. McGlashan, "Speech Recognition Grammar Specification Version 1.0", W3C Recommendation, March 2004. [16] Boulton, C., Melanchuk, T., McGlashan, S., and A. Shiratzky, "A Control Framework for the Session Initiation Protocol (SIP)", draft-boulton-sip-control-framework-01 (work in progress), March 2006. [17] Auburn, R J., "Voice Browser Call Control: CCXML Version 1.0", W3C Working Draft (work in progress), June 2005. [18] McGlashan, S., Burnett, D., Carter, J., Danielsen, P., Ferrans, J., Hunt, A., Lucas, B., Porter, B., Rehor, K., and S. Tryphonas, "Voice Extensible Markup Language (VoiceXML) Version 2.0", W3C Recommendation, March 2004. [19] Melanchuk, T., "Media Session Markup Language (MSML)", Boulton, et al. Expires September 9, 2006 [Page 43] Internet-Draft Media Server Control Package March 2006 draft-melanchuk-sipping-msml-07 (work in progress), November 2005. [20] McGlashan, S., Auburn, R., Burke, D., Candell, E., and R. Surapaneni, "Media Server Control Protocol (MSCP)", draft-mcglashan-mscp-01 (work in progress), January 2006. [21] Bray, T., Paoli, J., Sperberg-McQueen, C M., Maler, E., and F. Yergeau, "Extensible Markup Language (XML) 1.0 (Third Edition)", W3C Recommendation, February 2004. Boulton, et al. Expires September 9, 2006 [Page 44] Internet-Draft Media Server Control Package March 2006 Authors' Addresses Chris Boulton Ubiquity Software Corporation Building 3 Wern Fawr Lane St Mellons Cardiff, South Wales CF3 5EA Email: cboulton@ubiquitysoftware.com Tim Melanchuk BlankSpace Email: tim.melanchuk@gmail.com Scott McGlashan Hewlett-Packard Gustav III:s boulevard 36 SE-16985 Stockholm, Sweden Email: scott.mcglashan@hp.com Asher Shiratzky Radvision 24 Raoul Wallenberg st Tel-Aviv, Israel Email: ashers@radvision.com Boulton, et al. Expires September 9, 2006 [Page 45] Internet-Draft Media Server Control Package March 2006 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Disclaimer of Validity This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The Internet Society (2006). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Boulton, et al. Expires September 9, 2006 [Page 46]