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 RFC2328 currently only defines the "IP4" address type.
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 RFC2119 [5].
3. Syntax
RFC2373 [1] gives an ABNF for the text representation of IPv6
addresses in Appendix B. RFC2732 [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 ]
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 RFC2327.
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", RFC2373, July 1998.
[2] Handley, M. and V. Jacobson, "SDP: Session Description
Protocol", RFC2327, April 1998.
[3] Hinden, R., Carpenter, B. and L. Masinter, "Format for Literal
IPv6 Addresses in URL's", RFC2732, December 1999.
[4] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC2234, November 1997.
[5] Bradner, S., "Key words for Use in RFCs to Indicate Requirement
Levels", BCP 14, RFC2119, 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>
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 RFCEditor function is currently provided by the
Internet Society.
