put transport in the request uri on outbound registers if register_transport is…

put transport in the request uri on outbound registers if register_transport is set and proxy does not already contain a transport param

src/mod/endpoints/mod_sofia/sofia.c

@@ -2148,8 +2148,13 @@ static void parse_gateways(sofia_profile_t *profile, switch_xml_t gateways_tag)
 			if (!zstr(from_domain)) {
 				gateway->from_domain = switch_core_strdup(gateway->pool, from_domain);
 			}
+			
+			if (!zstr(register_transport) && !switch_stristr("transport=", proxy)) {
+				gateway->register_url = switch_core_sprintf(gateway->pool, "sip:%s;transport=%s", proxy, register_transport);
+			} else {
+				gateway->register_url = switch_core_sprintf(gateway->pool, "sip:%s", proxy);
+			}
 
-			gateway->register_url = switch_core_sprintf(gateway->pool, "sip:%s", proxy);
 			gateway->register_from = switch_core_sprintf(gateway->pool, "<sip:%s@%s;transport=%s>",
 														 from_user, !zstr(from_domain) ? from_domain : proxy, register_transport);