allow exchage configuration for registrar

kamailio/registrar-role.cfg

@@ -26,6 +26,7 @@
 #!trydef REGISTRAR_FORCE_FAILOVER 0
 #!trydef REGISTRAR_CHECK_AMQP_AVAILABILITY 1
 #!trydef KZ_REGISTRAR_KEEPALIVE_UDP_ONLY 0
+#!trydef REGISTRAR_AMQP_EXCHANGE callmgr
 
 ######## Generic Hash Table container in shared memory ########
 modparam("htable", "htable", "auth_cache=>size=16;autoexpire=7200;")
@@ -183,7 +184,7 @@ route[HANDLE_REGISTER]
     $avp(kz_timeout) = $sel(cfg_get.kazoo.registrar_query_timeout_ms);
     $xavp(deltas=>query) = $(TV(Sn){s.replace,.,});
 
-    if(kazoo_async_query("callmgr", $var(amqp_routing_key), $var(amqp_payload_request), "KZ_AUTHORIZATION_REPLY", "KZ_AUTHORIZATION_TIMEOUT") != 1) {
+    if(kazoo_async_query("$def(REGISTRAR_AMQP_EXCHANGE)", $var(amqp_routing_key), $var(amqp_payload_request), "KZ_AUTHORIZATION_REPLY", "KZ_AUTHORIZATION_TIMEOUT") != 1) {
         xlog("L_INFO", "$ci|log|failed to send registrar query for authentication credentials for $Au $si:$sp\n");
         t_drop();
     }