Fix routing behavior of inbound calls from gateways that only match gateway…

Fix routing behavior of inbound calls from gateways that only match gateway based on the gw request uri param

we now honor the extension gateway param only if it is explicitly set, but will not route to the username param if extension is not set
also, new special value for extension "auto" that should use the request uri unless it has gw+ and then it will use the to uri

src/mod/endpoints/mod_sofia/mod_sofia.h

@@ -403,6 +403,7 @@ struct sofia_gateway {
 	char *register_from;
 	char *register_contact;
 	char *extension;
+	char *real_extension;
 	char *register_to;
 	char *register_proxy;
 	char *register_sticky_proxy;

src/mod/endpoints/mod_sofia/sofia.c

@@ -2056,10 +2056,6 @@ static void parse_gateways(sofia_profile_t *profile, switch_xml_t gateways_tag)
 				from_user = username;
 			}
 
-			if (zstr(extension)) {
-				extension = username;
-			}
-
 			if (zstr(proxy)) {
 				proxy = realm;
 			}
@@ -2151,8 +2147,13 @@ static void parse_gateways(sofia_profile_t *profile, switch_xml_t gateways_tag)
 				sipip = profile->sipip;
 			}
 
-			gateway->extension = switch_core_strdup(gateway->pool, extension);
+			if (zstr(extension)) {
+				extension = username;
+			} else {
+				gateway->real_extension = switch_core_strdup(gateway->pool, extension);
+			}
 
+			gateway->extension = switch_core_strdup(gateway->pool, extension);
 
 			if (!strncasecmp(proxy, "sip:", 4)) {
 				gateway->register_proxy = switch_core_strdup(gateway->pool, proxy);
@@ -6222,6 +6223,7 @@ void sofia_handle_sip_i_invite(nua_t *nua, sofia_profile_t *profile, nua_handle_
 	char acl_token[512] = "";
 	sofia_transport_t transport;
 	const char *gw_name = NULL;
+	const char *gw_param_name = NULL;
 	char *call_info_str = NULL;
 	nua_handle_t *bnh = NULL;
 	char sip_acl_authed_by[512] = "";
@@ -6854,7 +6856,7 @@ void sofia_handle_sip_i_invite(nua_t *nua, sofia_profile_t *profile, nua_handle_
 
 
 	if (sip->sip_request->rq_url->url_params) {
-		gw_name = sofia_glue_find_parameter_value(session, sip->sip_request->rq_url->url_params, "gw=");
+		gw_param_name = sofia_glue_find_parameter_value(session, sip->sip_request->rq_url->url_params, "gw=");
 	}
 
 	if (strstr(destination_number, "gw+")) {
@@ -6869,19 +6871,35 @@ void sofia_handle_sip_i_invite(nua_t *nua, sofia_profile_t *profile, nua_handle_
 		}
 	}
 
-	if (gw_name) {
-		sofia_gateway_t *gateway;
-		if (gw_name && (gateway = sofia_reg_find_gateway(gw_name))) {
+	if (gw_name || gw_param_name) {
+		sofia_gateway_t *gateway = NULL;
+		char *extension = NULL;
+
+		if (gw_name && ((gateway = sofia_reg_find_gateway(gw_name)))) {
+			gw_param_name = NULL;
+			extension = gateway->extension;
+		}
+
+		if (!gateway && gw_param_name) {
+			gateway = sofia_reg_find_gateway(gw_param_name);
+			extension = gateway->real_extension;
+		}
+
+		if (gateway) {
 			context = switch_core_session_strdup(session, gateway->register_context);
 			switch_channel_set_variable(channel, "sip_gateway", gateway->name);
 
-			if (gateway->extension) {
-				if (!strcasecmp(gateway->extension, "auto_to_user")) {
+			if (!zstr(extension)) {
+				if (!strcasecmp(extension, "auto_to_user")) {
 					destination_number = sip->sip_to->a_url->url_user;
+				} else if (!strcasecmp(extension, "auto")) {
+					if (gw_name) {
+						destination_number = sip->sip_to->a_url->url_user;
+					}
 				} else {
-					destination_number = switch_core_session_strdup(session, gateway->extension);
+					destination_number = switch_core_session_strdup(session, extension);
 				}
-			} else {
+			} else if (!gw_param_name) {
 				destination_number = sip->sip_to->a_url->url_user;
 			}