[OpenSIPS-Users] Cancel branch before failover on timeout

[Bogdan-Andrei Iancu]

Hello Ronald,

If the first GW sent any reply before the timeout, than OpenSIPS will
cancel it before hitting the failure route. If no reply at all sent by
GW1, OpenSIPS will hit the failure route on timeout without canceling.
If after this point (call send to GW2) first GW sends a reply :
    1) if a provisional reply (<200), it will be canceled on the spot
    2) if a 200 ok reply -> it will be accepted and fwd to calling device
        a) if the GW2 did not send a 200 OK, it will be canceled
        b) if GW2 also sent a 200 OK in the same time, both 200 OK will
be sent to calling device and it that device will decide what call to keep

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com


On 07/04/2013 07:41 PM, Ronald Cepres wrote:
>
> Bogdan,
>
> Thanks for the informative reply.
>
> What I really want to solve is a problem I encounter when the first GW
> doesnt respond after a defined timeout then Opensips does failover to
> next GW. A few seconds after the call is routed to second  GW, the
> first GW responds with 200 OK, which may cause problems. It seems that
> the first GW has a slow response time.
>
> The solution I am thinking of to prevent this is to send a cancel to
> the first GW before doing failover to next gateway. Does this make
> sense or is there a better solution?
>
> Thanks.
>
> -Ronald
>
> On Jul 4, 2013 11:58 PM, "Bogdan-Andrei Iancu" <bogdan at opensips.org
> <mailto:bogdan at opensips.org>> wrote:
>
>     Hello Ronald,
>
>     When you hit the failure route, there is no ongoing branch left
>     (doesn't matter how many you previously created) - so you should
>     not worry about this.
>
>     By SIP definition, a transaction fails (and OpenSIPS gets into
>     failure route) only when all branches failed.
>
>     Regards,
>
>     Bogdan-Andrei Iancu
>     OpenSIPS Founder and Developer
>     http://www.opensips-solutions.com
>
>
>     On 07/03/2013 10:43 PM, Ronald Cepres wrote:
>>     Hi all,
>>
>>     Is there a way I can cancel a pending branch before doing a
>>     fail-over to next gateway (due to timeout from previous gateway)?
>>     This way I can make sure that the call to the previous gateway
>>     will not go through anymore after fail-over to the next gateway,
>>     thus preventing us "double-charged" situations if the previous
>>     gateway and the new gateway both answered the call. 
>>
>>     Thanks in advance.
>>
>>
>>     -- 
>>
>>     Regards,
>>
>>     Ronald
>>
>>
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>
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