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 <users-boun...@lists.opensips.org> on behalf of Alex A <ale...@gtanetworkconsulting.com> Reply-To: OpenSIPS users mailling list <users@lists.opensips.org> Date: Wednesday, April 29, 2020 at 2:40 PM To: users <users@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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