[OpenSIPS-Users] Drouting failover by carrier only

[Alex A]

Setting the "First Only" flag on the carrier seem to be done the trick for me. 
It round-robins, while failing over to another carrier directly.


Thank you for your help.




---- On Thu, 30 Apr 2020 07:12:04 -0400 Alex A <mailto:alex.a at gtanetworkconsulting.com> wrote ----


Thank you for the tip, Ben. 

Do you by chance have a script snipped for this scenario? 

For some reason, the drouting part:
        if (!do_routing(0,"F")) {

                xlog("DRoute GATEWAY: Failed. source:$si -$fU -> $rU\n");

                send_reply(500, "No Gateway to Route found");

                exit;

        }

        xlog("Before Entering Relay\n CarrierID_avp: $avp(carrier_id), GW ID avp: $avp(gw_id)");

        route(relay);



Both AVPs return a single value instead of the a list for me, so I must be missing something.





Thanks.





---- On Wed, 29 Apr 2020 14:50:38 -0400 Ben Newlin <mailto:Ben.Newlin at genesys.com> wrote ----


We also had a need to do this and did not find a way to do it via drouting directly, but it will work with drouting with a little help.

 

First, we specify the carrier_id_avp param [1]. After we call do_routing, we copy out the carrier IDs from that avp into our own AVP. Then we use route_to_carrier [2] for each carrier ID in the list. To continue routing within the carrier,
 you can still do use_next_gw. When that returns false (no more gateways), or if you want to skip to the next carrier you just call route_to_carrier again with the next ID in your list.

 

This solved two problem for us:

* allows us to fail over by carrier instead of just by gateway

* allows us to call do_routing multiple times for a call with different groups and aggregate the results

 

[1] - https://opensips.org/docs/modules/3.0.x/drouting.html#param_carrier_id_avp

[2] - https://opensips.org/docs/modules/3.0.x/drouting.html#func_route_to_carrier

 

 

Ben Newlin


 

From: Users <mailto:users-bounces at lists.opensips.org> on behalf of Alex A <mailto:alex.a at gtanetworkconsulting.com>
 Reply-To: OpenSIPS users mailling list <mailto:users at lists.opensips.org>
 Date: Wednesday, April 29, 2020 at 2:40 PM
 To: users <mailto:users at lists.opensips.org>
 Subject: [OpenSIPS-Users] Drouting failover by carrier only

 


Hi Everyone,


 


Is it possible to failover to next carrier (instead next gateway) while using drouting?


 


 


I got the below to work; however currently, use_next_gw gets the next gateway in the list, so


if gwlist= #0,#3 


 


and one of the carriers has multiple gateway IPs, the retry happens many times to the same carrier:


 


 


route[droute] {


 


        xlog("DRoute GATEWAY: source:$si - $fU -> $rU\n");


        if (!do_routing(0,"F")) {


                xlog("DRoute GATEWAY: Failed. source:$si -$fU -> $rU\n");


                send_reply(500, "No Gateway to Route found");


                exit;


        }


        route(relay);


        exit;


 


        }


 



route[relay] {


 


        if (is_method("INVITE")) {


                t_on_failure("missed_call");


        }


 


        if (!t_relay()) {


                if (use_next_gw()) {


                      xlog("L_INFO","Next Gateway: From=$fu, To=$tu,RU=$ru, CI=$ci IP=$si\n");


                      t_on_failure("missed_call");


                      route(relay);


                      exit;


                }


                else {


                        send_reply(503, "Service not available, no more gws");


                        exit;


                }


        };


        exit;


}


 


 


failure_route[missed_call] {


 


                #if (use_next_gw(, , $var(carrier_attrs))) {


                if (use_next_gw(, $avp(gw_id),$avp(carrier_id))) {


                      xlog("MissedCall--Next Gateway: From=$fu, To=$tu,RU=$ru, CI=$ci IP=$si\n");


                      xlog("Carrier attributes of current gateway: $avp(gw_id). carrier: $avp(carrier_id)\n");


 


                      t_on_failure("missed_call");


                      route(relay);


                      exit;


                }


                else {


                        send_reply(503, "Service not available, no more gws");


                        exit;


                }


 


 


 


 


Thank you.


 


 


 








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