RFC 3311 (rfc3311) - Page 1 of 13

The Session Initiation Protocol (SIP) UPDATE Method

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Network Working Group                                       J. Rosenberg
Request for Comments: 3311                                   dynamicsoft
Category: Standards Track                                 September 2002


          The Session Initiation Protocol (SIP) UPDATE Method

Status of this Memo

   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.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   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.























Rosenberg                   Standards Track
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