A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Session Initiation Protocol Working Group of the IETF.
Title : Addressing Record-Route issues in the Session Initiation Protocol (SIP)
Author(s) : T. Froment, C. Lebel
Filename : draft-ietf-sip-record-route-fix-02.txt
Pages : 26
Date : 2008-02-22
A typical function of a Session Initiation Protocol (SIP) Proxy is to
set a Record-Route header on initial requests in order to make
subsequent requests pass through it. This header contains a SIP
Uniform Resource Identifier (URI) indicating where and how the
subsequent requests should be sent to reach the proxy. Like any SIP
URI, it can contain sip or sips schemes, IPV4 or IPV6 addresses, and
URI parameters that could influence the routing like different
transport parameters (UDP, TCP, SCTP...), or a compression indication
like "comp=sigcomp". When a proxy has to change some of those
parameters between its incoming and outgoing interfaces (multi-homed
proxies, transport protocol switching, sip to sips or IPV4 to IPV6
scenarios...), the question arises on what should be put in Record-
Route header(s). It is just not possible to make one header having
the characteristics of both sides at the same time. This document
aims to clarify these scenarios and fix bugs already identified on
this topic; it formally recommends the use of the double Record-Route
technique as an alternative to the current RFC3261 text, which
describes only a Record-Route rewriting solution.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-sip-record-route-fix-02.txt
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