On Tue, 2008-11-25 at 15:32 +0000, Gabor Paller wrote:
> Hi,
> 
>  
> 
> I am investigating a strange case (see attached SIP log. I edited the
> long and clunky SIP log, if anyone is interested, I can provide the
> original). There is an incoming call (User 405, from 10.1.5.74) to
> user 402 which is branched to two endpoints subscribed to user 405
> (SIP001E136C6F0.test.onrelay.local.sip is a desk phone,
> sipxecs.test.onrelay.local.5560 is a software agent). The desk phone
> starts to ring, the software agent starts to set up a call, emits 183
> Session progress responses and eventually a 180 Ringing (at
> 10:33:47.521220). Then, miraculously, the SipX proxy cancels the desk
> phone branch (at 10:34:00.950099). The call setup with the other
> branch goes on and eventually succeeds (edited out from the log,
> nothing unusual there).


I believe that you're just seeing the normal 20-second expiration of the
branch.  The other one is not CANCELed because it sent SDP - this
triggers some exception handling because early media sessions are
sometimes used by PSTN gateways for extended periods of time.


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