Internet Engineering Task Force (IETF) G. Camarillo
Request for Comments: 6157 Ericsson
Updates: 3264 K. El Malki
Category: Standards Track Athonet
ISSN: 2070-1721 V. Gurbani
Bell Labs, Alcatel-Lucent
April 2011
IPv6 Transition in the Session Initiation Protocol (SIP)
Abstract
This document describes how the IPv4 Session Initiation Protocol
(SIP) user agents can communicate with IPv6 SIP user agents (and vice
versa) at the signaling layer as well as exchange media once the
session has been successfully set up. Both single- and dual-stack
(i.e., IPv4-only and IPv4/IPv6) user agents are considered.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6157.
Copyright Notice
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Camarillo, et al. Standards Track [Page 1]RFC 6157 IPv6 Transition in SIP April 2011
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. The Signaling Layer . . . . . . . . . . . . . . . . . . . . . 4
3.1. Proxy Behavior . . . . . . . . . . . . . . . . . . . . . . 4
3.1.1. Relaying Requests across Different Networks . . . . . 5
3.2. User Agent Behavior . . . . . . . . . . . . . . . . . . . 7
4. The Media Layer . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Updates to RFC 3264 . . . . . . . . . . . . . . . . . . . 9
4.2. Initial Offer . . . . . . . . . . . . . . . . . . . . . . 9
4.3. Connectivity Checks . . . . . . . . . . . . . . . . . . . 10
5. Contacting Servers: Interaction of RFC 3263 and RFC 3484 . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . . 12
Appendix A. Sample IPv4/IPv6 DNS File . . . . . . . . . . . . . . 14
1. Introduction
SIP [3] is a protocol to establish and manage multimedia sessions.
After the exchange of signaling messages, SIP endpoints generally
exchange session or media traffic, which is not transported using SIP
but a different protocol. For example, audio streams are typically
carried using the Real-Time Transport Protocol (RTP) [13].
Consequently, a complete solution for IPv6 transition needs to handle
both the signaling layer and the media layer. While unextended SIP
datatracker.ietf.org