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The Session Initiation Protocol (SIP) UPDATE Method

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 3311.
Author Jonathan Rosenberg
Last updated 2015-10-14 (Latest revision 2002-05-01)
RFC stream Internet Engineering Task Force (IETF)
Additional resources Mailing list discussion
Stream WG state (None)
Document shepherd (None)
IESG IESG state RFC 3311 (Proposed Standard)
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD Allison J. Mankin
Send notices to <>
A new Request for Comments is now available in online RFC libraries.

        RFC 3311

        Title:      The Session Initiation Protocol (SIP)
                    UPDATE Method
        Author(s):  J. Rosenberg
        Status:     Standards Track
        Date:       October 2002
        Pages:      13
        Characters: 28125
        Updates/Obsoletes/SeeAlso:    None
        I-D Tag:    draft-ietf-sip-update-02.txt


This specification defines the new UPDATE method for the Session
Initiation Protocol (SIP).  UPDATE allows a client to update
parameters of a session (such as the set of media streams and their
codecs) but has no impact on the state of a dialog.  In that sense,
it is like a re-INVITE, but unlike re-INVITE, it can be sent before
the initial INVITE has been completed.  This makes it very useful for
updating session parameters within early dialogs.

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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