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Network Working Group                                           S. Olson
Request for Comments: 3266                                     Microsoft
Updates: 2327                                               G. Camarillo
Category: Standards Track                                       Ericsson
                                                             A. B. Roach
                                                             dynamicsoft
                                                               June 2002
Support for IPv6 in Session Description Protocol (SDP)

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2002). All Rights Reserved.

Abstract

This document describes the use of Internet Protocol Version 6 (IPv6) addresses in conjunction with the Session Description Protocol (SDP). Specifically, this document clarifies existing text in SDP with regards to the syntax of IPv6 addresses.
1. Introduction
SDP is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation. It is a text format description that provides many details of a multimedia session including: the originator of the session, a URL related to the session, the connection address for the session media(s), and optional attributes for the session media(s). Each of these pieces of information may involve one or more IPv6 addresses. The ABNF for IP addresses in SDP currently leaves the syntax for IPv6 addresses undefined. This document attempts to complete the ABNF to include IPv6 addresses.

Accordingly, the address type "IP6" indicating an IPv6 address, should be allowed in the connection field, "c=", of the SDP. The ABNF already reflects this, though the "Connection Data" text under section 6 of RFC 2328 currently only defines the "IP4" address type.
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RFC 3266    Support for IPv6 in Session Description Protocol   June 2002
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [5].
3. Syntax
RFC 2373 [1] gives an ABNF for the text representation of IPv6 addresses in Appendix B. RFC 2732 [3] covers the text representation of IPv6 addresses when used within a URL. Using the ABNF described in these documents, the following updated ABNF for SDP is proposed.

uri = ; defined in RFC1630 and RFC2732

multicast-address = IP4-multicast / IP6-multicast

IP4-multicast = m1 3*( "." decimal-uchar ) "/" ttl [ "/" integer ] ; IPv4 multicast addresses may be in the ; range 224.0.0.0 to 239.255.255.255

m1 = ("22" ("4"/"5"/"6"/"7"/"8"/"9")) /
("23" DIGIT ))

IP6-multicast = hexpart
; IPv6 address starting with FF

addr = FQDN / unicast-address

FQDN = 4*(alpha-numeric/"-"/".") ; fully qualified domain name as specified ; in RFC1035 unicast-address = IP4-address / IP6-address

IP4-address = b1 3*("." decimal-uchar) / "0.0.0.0"

b1 = decimal-uchar
; less than "224"; not "0" or "127"

; The following is from RFC2373 Appendix B. It is a direct copy. IP6-address = hexpart [ ":" IP4-address ]

hexpart = hexseq / hexseq "::" [ hexseq ] /
"::" [ hexseq ]
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RFC 3266    Support for IPv6 in Session Description Protocol   June 2002
hexseq = hex4 *( ":" hex4)

hex4 = 1*4HEXDIG
4. Example SDP description with IPv6 addresses
The following is an example SDP description using the above ABNF for IPv6 addresses. In particular, the origin and connection fields contain IPv6 addresses.

v=0 o=nasa1 971731711378798081 0 IN IP6 2201:056D::112E:144A:1E24 s=(Almost) live video feed from Mars-II satellite p=+1 713 555 1234 c=IN IP6 FF1E:03AD::7F2E:172A:1E24 t=3338481189 3370017201 m=audio 6000 RTP/AVP 2 a=rtpmap:2 G726-32/8000 m=video 6024 RTP/AVP 107 a=rtpmap:107 H263-1998/90000
5. Note for implementors
An implementation may receive an SDP session description with an IPv6 address whose format [1] is internally that of an IPv4 mapped address. Note that such an address is actually the address of an IPv4-only node, and implementors are warned to interpret IPv4 mapped addresses as equivalent to IP4.
6. IANA Considerations
This document updates the definition of the IP6 addrtype parameter found in RFC 2327.
7. Security Considerations
No additional considerations above what is stated in section 7 of RFC 2327.
8. References
[1] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 2373, July 1998.

[2] Handley, M. and V. Jacobson, "SDP: Session Description
Protocol", RFC 2327, April 1998.
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RFC 3266    Support for IPv6 in Session Description Protocol   June 2002
[3] Hinden, R., Carpenter, B. and L. Masinter, "Format for Literal
IPv6 Addresses in URL's", RFC 2732, December 1999.

[4] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 2234, November 1997.

[5] Bradner, S., "Key words for Use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
9. Authors' Addresses
Sean Olson Microsoft One Microsoft Way Redmond, WA 98052 USA

EMail: seanol@microsoft.com


Gonzalo Camarillo Ericsson Advanced Signalling Research Lab. FIN-02420 Jorvas Finland

Phone: +358 9 299 3371 Fax: +358 9 299 3118 EMail: Gonzalo.Camarillo@ericsson.com


Adam Roach dynamicsoft 5100 Tennyson Parkway Suite 1200 Plano, TX 75024 USA

EMail: adam@dynamicsoft.com Voice: <sip:adam@dynamicsoft.com>
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RFC 3266    Support for IPv6 in Session Description Protocol   June 2002
10.  Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved.

This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.

The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS 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.

Acknowledgement

Funding for the RFC Editor function is currently provided by the Internet Society.



















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