[OpenSIPS-Users] Avpops failure route

[Bogdan-Andrei Iancu]

Hi Andrew,

just ran a timeout scenario with 1.6 :
    proxy sends call to destination A
    A gives no final reply
    proxy gives timeout
    proxy sends CANCEL to A
    proxy sends call to new destination B
    proxy receives 200 OK for CANCEL and 487 for call from A.
    .....

So, what is the scenario where you have the  new INVITE before the 
CANCEL of a existing INVITE ?

Regards,
Bogdan

Andrew Pogrebennyk wrote:
> Hi,
> 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:
>>     
>
>   


-- 
Bogdan-Andrei Iancu
www.voice-system.ro