Updating method


15-Dec-2015 04:36

This makes it very useful for updating session parameters within early dialogs.Table of Contents 1 Introduction .............................................. 2 2 Terminology ............................................... 3 3 Overview of Operation ..................................... 3 4 Determining Support for this Extension ....................However, this method actually affects two important pieces of state.It impacts the session (the media streams SIP sets up) and also the dialog (the state that SIP itself defines).Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.

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.7 8 Example Call Flow ......................................... 7 9 Security Considerations ................................... 11 10 IANA Considerations ....................................... 11 11 Notice Regarding Intellectual Property Rights .............11 12 Normative References ...................................... 11 13 Acknowledgements .......................................... 12 14 Author's Address .......................................... 12 15 Full Copyright Statement .................................. 13 The Session Initiation Protocol (SIP) [1] defines the INVITE method for the initiation and modification of sessions.

updating method-1

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While this is reasonable in many cases, there are important scenarios in which this coupling causes complications.

The primary difficulty is when aspects of the session need to be modified before the initial INVITE has been answered.



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