Title: The Session Initiation Protocol (SIP) UPDATE Method
Author(s): J. Rosenberg.
Status: PROPOSED STANDARD
Date: Oct 2002
Length: 28125
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.
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