[OpenSIPS-Users] Reroute B2B call after failure

[Ovidiu Sas]

If you want to use opensips in b2b mode and still have failover, you
will need to use two instances of opensips:
 - one in b2b mode,
 - one in proxy mode and doing the failover.
It seems that you already have the setup, so all that you need to do
on the proxy (on the failure case) is to send the INVITE back to the
OpenSIPSB2BUA with RURI pointing to the Backup SIP Gateway B,


Regards,
Ovidiu Sas

On Mon, May 16, 2011 at 10:04 PM,  <duane.larson at gmail.com> wrote:
> I have the following setup
>
>
> ----- Primary SIP Gateway A XXX.XXX.XXX.XXX
> Phones <-> OpenSIPSProxy <-> OpenSIPSB2BUA <-> SIP Trunk Provider |
> ----- Backup SIP Gateway B YYY.YYY.YYY.YYY
>
> So my SIP trunk provider (Bandwidth.com) provided me with two gateways to
> send my calls to (One is the primary and the other is the backup in case the
> first doesn't work). I am trying to figure out how I can set up the
> OpenSIPSB2BUA so that if the first gateway is down the call will timeout and
> send the call to the Backup Gateway. Normally this would be easy but since
> the call is being executed with the b2b_init_request() function I can't set
> a failure route and then when the first call to the Primary Gateway fails
> set my $rd to the Backup gateway and call b2b_init_request() since
> b2b_init_request() can only be executed on the initial INVITE.
>
>
> Has anyone run into this scenario yet? Anyone have any ideas on a possible
> solution?
>
> If the OpenSIPSB2BUA can't do anything with the timeout then it will need to
> fail back to the OpenSIPSProxy, but I am not sure what I can do on the
> OpenSIPSProxy since all he does is set $rd to the IP Address of
> OpenSIPSB2BUA and t_relay() it.
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