Counter question: why should a re-INVITE do not update the session timer?
E.g. your receive a re-INVITE with a change SDP 2 seconds before the Session 
expires. Now you do not update the session but terminate the session 2 
seconds later!?
Is their some higher goal which you are trying to reach by not updating the 
Session Timer, which I currently do not see?

Regards
  Nils

On Tuesday 26 October 2004 00:00, Christina Zhao wrote:
> Hi, I have another question regarding Session Timer:
>
> If the refresher is uac, how can the uas determine the re-INVITE is
> for the purpose of session refresh?  (assuming uas needs to tell the
> difference between a Session Refresh re-INVITE and other purpose
> re-INVITEs so that it can pursue different process. )
>
> There could be re-INVITEs that are Target Refresh Request (RFC3261
> 12.2), and re-INVITEs that change SDP.
>
> My idea is to determine by checking if the header part contains
> "Supported: timer", but I am not sure this condition is good enough.
>
> I will appreciate very much for any convincing opinion.
>
> Christina
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