Sipping P. Kyzivat Internet-Draft Cisco Systems, Inc. Expires: January 9, 2005 July 11, 2004 Reg Event Package Extension for GRUUs draft-kyzivat-sipping-gruu-reg-event-00 Status of this Memo This document is an Internet-Draft and is subject to all provisions of section 3 of RFC 3667. 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 become aware will be disclosed, in accordance with RFC 3668. 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 January 9, 2005. Copyright Notice Copyright (C) The Internet Society (2004). All Rights Reserved. Abstract This draft defines an extension to RFC 3680 [1] for representing the GRUU associated with a Contact. 1. Introduction The proposal to add GRUU support to the REGISTER message [2] introduces another element of state to the registrar. Subscribers to the registration event package [1] will sometimes have need for the Kyzivat Expires January 9, 2005 [Page 1] Internet-Draft Reg Event GRUU Extension July 2004 new state. For example, the Welcome Notices example in [1] will only operate correctly if the contact address in the reg event notification is reachable by the sender of the welcome notice. When the registering device is using the gruu extension, it is likely that the registered contact address will not be globally addressable, and the gruu should be used as the target address for the MESSAGE. The reg event package has provision for including extension elements within the <contact> element. This draft proposes a new element that may be used in that context to deliver the GRUU corresponding to the contact. 2. Description A new element (<gruu>) is defined which simply contains the GRUU. A notifier for the "reg" event package SHOULD include this element when a contact has an Instance ID and a GRUU is associated with the combination of the AOR and the Instance ID. When used, the <gruu> element MUST be used within the <contact> element. 3. Example The following is an example registration information document: <?xml version="1.0"?> <reginfo xmlns="urn:ietf:params:xml:ns:reginfo" xmlns:gr="urn:ietf:params:xml:ns:gruu" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="0" state="full"> <registration aor="sip:user@example.com" id="as9" state="active"> <contact id="76" state="active" event="registered" duration-registered="7322" q="0.8"> <uri>sip:user@192.0.2.1</uri> <unknown-param name="+sip.instance"> "<urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6>" </unknown-param> <gr:gruu>sip:hha9s8d=-999a@example.com</gruu> </contact> </registration> </reginfo> Kyzivat Expires January 9, 2005 [Page 2] Internet-Draft Reg Event GRUU Extension July 2004 4. XML Schema Definition An gruu document is an XML document that MUST be well-formed and SHOULD be valid. Gruu documents MUST be based on XML 1.0 and MUST be encoded using UTF-8. This specification makes use of XML namespaces for identifying gruu documents. The namespace URI for elements defined for this purpose is a URN, using the namespace identifier 'ietf'. This URN is: urn:ietf:params:xml:ns:gruu <?xml version="1.0" encoding="UTF-8"?> <xs:schema targetNamespace="urn:ietf:params:xml:ns:gruu" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="urn:ietf:params:xml:ns:gruu"> <xs:element name="gruu" type="xs:anyURI"/> </xs:schema> 5. IANA Considerations TBD. 6. Security Considerations Security considerations for the registration event package is discussed in RFC 3680 [1], and those considerations apply here. The addition of gruu information does not impact security negatively because the gruu is less sensitive than the contact URI itself. 7. Acknowledgements The author would like to thank Jonathan Rosenberg for encouraging this draft. 8. References 8.1 Normative References [1] Rosenberg, J., "A Session Initiation Protocol (SIP) Event Package for Registrations", RFC 3680, March 2004. [2] Rosenberg, J., "Obtaining and Using Globally Routable User Agent (UA) URIs (GRUU) in the Session Initiation Protocol (SIP)", draft-ietf-sip-gruu-02 (work in progress), July 2004. Kyzivat Expires January 9, 2005 [Page 3] Internet-Draft Reg Event GRUU Extension July 2004 8.2 Informative References [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. Author's Address Paul H. Kyzivat Cisco Systems, Inc. 1414 Massachusetts Avenue Boxborough, MA 01719 USA EMail: pkyzivat@cisco.com Kyzivat Expires January 9, 2005 [Page 4] Internet-Draft Reg Event GRUU Extension July 2004 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. 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