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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.
+
+
+
+
+Olson, et. al. Standards Track [Page 1]
+
+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 ]
+
+
+
+
+
+
+Olson, et. al. Standards Track [Page 2]
+
+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.
+
+
+
+
+
+Olson, et. al. Standards Track [Page 3]
+
+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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+
+
+Olson, et. al. Standards Track [Page 4]
+
+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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+Olson, et. al. Standards Track [Page 5]
+