Re: [Sip] Question on UPDATE after INVITE completion

[Gonzalo Camarillo <Gonzalo.Camarillo@lmf.ericsson.se>]

Hello,

"Fuxbruner, Amihay" wrote:
> 
> What is the purpose of sending UPDATE after INVITE completion ?
> Is this another way for re-INVITE ?

UPDATE involves only two messages, so it can be useful for saving
bandwidth. re-INVITE is still needed, though, because in some scenarios
you cannot provide an offer in the re-INVITE, and you have to wait for
an offer in the response. UPDATe does not support this
three-way-handshake.

Regards,

Gonzalo

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