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List:       sip-implementors
Subject:    Re: [Sip-implementors] ReInvite impacts "State of transcation" - what does this statement mean
From:       Iñaki_Baz_Castillo <ibc () aliax ! net>
Date:       2010-08-14 15:19:21
Message-ID: AANLkTinLAXHTcRPHwe0igRrPqQLW1H6NdReqP=DYTRoP () mail ! gmail ! com
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2010/8/14 Bhupesh Rautela <bhupesh.rautela@gmail.com>:
> All,
> RFC 3311 mentions "INVITE has an impact on the state of the dialog, in
> addition to the session."
>
> However what it does not mention that what exactly is that "impact". How is
> the state of dialog and session impacted?

A re-INVITE can modify the SDP (session) and also the target (dialog)
by sending a different Contact uri.



> Is it trying to say here that session dialog parameters like To tag, From
> tag Cseq is change for Re-Invite ?

Of course no. These parameters cannot change during a (early-)dialog.


> How is UPDATE different here?

The caller can send an UPDATE during the early dialog to change
session information (SDP). This is not possible with a re-INVITE.



-- 
Iñaki Baz Castillo
<ibc@aliax.net>


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