[OpenSIPS-Users] Avpops failure route

Andrew Pogrebennyk andrew.pogrebennyk at portaone.com
Sat Dec 12 09:54:05 CET 2009

Perhaps someone could chime in on this..

Andrew Pogrebennyk wrote:
> Bogdan,
> You are correct. But the thing is that when fr_inv_timer hits, OpenSIPS 
> (prematurely) sends INVITE on the next branch and only after that 
> CANCELs the previous one. And if the gateway receives different branch 
> on transaction to which no final reply has been sent yet - it can merge 
> the requests. Let me know if you need the traces, but I've found this 
> behavior to be consistent in the versions 1.3.2 - 1.5.3.
> Another thing I've found is that OpenSIPS resets the fr_timer in 
> retransmission_handler() if no provisional response to INVITE has been 
> received, or retransmission_handler() seems to affect the fr_timer somehow.
> Here we see that it forwards the INVITE and sets FR_TIMER as per script:

Andrew Pogrebennyk
PortaOne, Inc., QA Engineer
andrew.pogrebennyk at portaone.com
Tel: +1-866-SIP VOIP (+1 866 747 8647) ext. 7133

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