Updated Pass-Thru Authentication

- Added support to handle pass-thru when the hostname of the media server is used as the endpoint.

kamailio/configs/kamailio.cfg

@@ -779,7 +779,7 @@ modparam("htable", "htable", "inbound_failfwd=>size=8;autoexpire=0;dmqreplicate=
 # inbound_prefixmap is used to lookup dr_ruleid for a prefix
 modparam("htable", "htable", "inbound_prefixmap=>size=8;autoexpire=0;dmqreplicate=DMQ_REPLICATE_ENABLED;dbtable=dsip_prefix_mapping;cols='prefix,ruleid,priority';")
 # to manage Pass Thru Auth for Registration. Used to send Authorization requests back to the same backend media server
-modparam("htable", "htable", "pass_thru_auth=>size=8;autoexpire=30;dmqreplicate=DMQ_REPLICATE_ENABLED;")
+modparam("htable", "htable", "pass_thru_auth=>size=8;autoexpire=3600;dmqreplicate=DMQ_REPLICATE_ENABLED;")
 # enrichdnid_lnpmap is used to lookup dnid prefixes to match against
 # to manage callid to inbound endpoint map. Entries will expire in 24 hours (1440 seconds)
 modparam("htable", "htable", "callid_inbound_endpoint_map=>size=8;autoexpire=1440;dmqreplicate=DMQ_REPLICATE_ENABLED;")
@@ -1879,9 +1879,22 @@ route[REGISTRAR] {
 			#Add the Path header for SIP UAC's - so that we know how to route back
 			add_path_received($fU);
 		}
-
+ 
 		# Store the pbx ip to domain mapping so that SIP messages from the PBX can be rewritten
-		$sht(pass_thru_auth=>$(avp(domain_pbx_ip){s.select,0,:})) = $var(rd_orig);
+                if !is_ip($(avp(domain_pbx_ip){s.select,0,:})) {
+                        if(dns_query($(avp(domain_pbx_ip){s.select,0,:}),"xyz"))
+                        {
+                                $var(i) = 0;
+                                while($var(i)<$dns(xyz=>count)) {
+                                        $sht(pass_thru_auth=>$dns(xyz=>addr[$var(i)])) = $var(rd_orig);
+                                        $var(i) = $var(i) + 1;
+                                 }
+                        }
+
+                }
+                else {
+                        $sht(pass_thru_auth=>$(avp(domain_pbx_ip){s.select,0,:})) = $var(rd_orig);
+                }
 
 		#We are going to pass this request on to the backend server
 		route(RELAY);