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
>
>
>
>
>
> _______________________________________________
> Users mailing list
> [email protected]
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>
--
Bogdan-Andrei Iancu
OpenSIPS Bootcamp
20 - 24 September 2010, Frankfurt, Germany
www.voice-system.ro
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