From RFC 3311:
SIP method update
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.
- http://www.ietf.org/rfc/rfc3311.txt, The Session Initiation Protocol (SIP) UPDATE Method, J Rosenberg, September 2002
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