| Abstract
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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 can be sent before the initial INVITE has
completed. This makes it very useful for updating session parameters
within early dialogs.
Table of Contents
1 Introduction ........................................ 3
2 Terminology ......................................... 3
3 Overview of Operation ............................... 3
4 Determining Support for this Extension .............. 4
5 UPDATE Handling ..................................... 4
5.1 Sending an UPDATE ................................... 4
5.2 Receiving an UPDATE ................................. 6
5.3 Processing the UPDATE Response ...................... 6
6 Proxy Behavior ...................................... 7
7 Definition of the UPDATE method ..................... 7
8 Example Call Flow ................................... 7
9 Security Considerations ............................. 11
10 IANA Considerations ................................. 11
11 Acknowledgements .................................... 11
12 Author's Addresses .................................. 11
13 Normative References ................................ 11
14 Informative References .............................. 12
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