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An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing
draft-ietf-sip-symmetric-response-01

The information below is for an old version of the document that is already published as an RFC.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 3581.
Authors Henning Schulzrinne , Jonathan Rosenberg
Last updated 2015-10-14 (Latest revision 2003-07-03)
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Formats
Additional resources Mailing list discussion
Stream WG state (None)
Document shepherd (None)
IESG IESG state Became RFC 3581 (Proposed Standard)
Action Holders
(None)
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD Allison J. Mankin
IESG note
Send notices to <rohan@cisco.com>
draft-ietf-sip-symmetric-response-01
A new Request for Comments is now available in online RFC libraries.

        RFC 3581

        Title:      An Extension to the Session Initiation Protocol
                    (SIP) for Symmetric Response Routing
        Author(s):  J. Rosenberg, H. Schulzrinne
        Status:     Standards Track
        Date:       August 2003
        Mailbox:    jdrosen@dynamicsoft.com,
                    schulzrinne@cs.columbia.edu
        Pages:      13
        Characters: 66133
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-ietf-sip-symmetric-response-01.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3581.txt

The Session Initiation Protocol (SIP) operates over UDP and TCP, among
others.  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 from which the request originated.

This document is a product of the Session Initiation Protocol Working
Group of the IETF.

This is now a Proposed Standard Protocol.

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.

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