[OpenSIPS-Users] 302 redirect problem

[Bogdan-Andrei Iancu]

Hi Nauman,

Just a wild guess - maybe VoipFone sends CANCEL after the second 180 
because of different to-tags in first 180 (from UAC1) and the second 180 
(from UAC2) - normally it should not be a problem, but you never know 
with all these implementations...

Regarding sipgate, it may be because of the same cause.....

We can try a simple experiment to strip out the to-tag from all 
provisional replies - to see if it works or not.

Regards,
Bogdan

Nauman Sulaiman wrote:
> Hi , we have a set up where we are using a SIP proxy( OpenSIPS) to handle a 302 redirect locally but it doesn't seem to be working with voip providers here is the call flow. Is it legal, if so we'll bother you with a SIP trace. The 302 is handled locally by the OpenSIPS proxy and generates a new call leg but can't establish a dialog with Sipgate or Voipfone
>
>                  INVITE             INVITE
> VoipFone Server ---------> Proxy ------------> UAC1
>                   Trying
> VoipFone  Server <--------  Proxy
>                                     180 Ring
>                  180 Ring       <------------- UAC1
>                 <------    Proxy    302 Redir
>                                 <-------------- UAC1
>                                     INVITE
>                                 ---------------> UAC2
>                                    180 Ring
>                                 <----------------UAC2
>                   180 Ring
> VoipFone Server <----------   
>                   CANCEL     
>                ------------>         200 OK
>                  200 OK         <--------------- UAC2
>                <------------
>
> THe VoipFone server sends a cancel straight after the 180 ring, Sipgate
> doesn't do this however it never sends an ACK for the 200K, anyway both
> don't like what we are doing.
>
> We need to do the 302 redirect locally on our proxy as not all Voip providers support it so we can't let it go all the way back. Hope its clear what we are trying to, and is there any way forward.
>
> Here is the code in our opensips.cfg file 
>
> failure_route[1] {
>         if (t_was_cancelled()) {
>                 exit;
>         }
>
>         get_redirects("3:1");
>         t_relay();
> }
>
> Thanks
>
>
>
>       
>
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>
>   


-- 
Bogdan-Andrei Iancu
OpenSIPS Bootcamp
20 - 24 September 2010, Frankfurt, Germany
www.voice-system.ro