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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 : An Extension to the Session Initiation Protocol (SIP)
for Symmetric Response Routing
Author(s) : J. Rosenberg, H. Schulzrinne
Filename : draft-ietf-sip-symmetric-response-01.txt
Pages : 19
Date : 2003-7-3
The Session Initiation Protocol (SIP) operates over UDP and TCP. When
used with UDP, responses to requests are returned to the source
address the request came from, and to the port written into the
topmost Via header field value of the request. This behavior is not
desirable in many cases, most notably, when the client is behind a
Network Address Translator (NAT). This extension defines a new
parameter for the Via header field, called 'rport', that allows a
client to request that the server send the response back to the
source IP address and port where the request came from.
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