handle inbound notifies like options

kamailio/default.cfg

@@ -223,6 +223,8 @@ route
 
     route(HANDLE_OPTIONS);
 
+    route(HANDLE_NOTIFY);
+
     route(HANDLE_MESSAGE);
 
     route(HANDLE_MOVE_REQUEST);
@@ -296,6 +298,23 @@ route[HANDLE_OPTIONS]
     }
 }
 
+route[HANDLE_NOTIFY] 
+{
+    if (is_method("NOTIFY")) {
+        if (isflagset(FLAG_INTERNALLY_SOURCED)) {
+            route(INTERNAL_TO_EXTERNAL_RELAY);
+        #!ifdef TRAFFIC-FILTER-ROLE
+        } else if (!isflagset(FLAG_TRUSTED_SOURCE)
+            && $rd =~ "[0-9]{1,3}\.[0-9]{1,3}.[0-9]{1,3}\.[0-9]{1,3}") {
+            xlog("L_WARN", "$ci|end|dropping OPTIONS request with IP domain");
+        #!endif
+        } else {
+            sl_send_reply("200", "Rawr!!");
+        }
+        exit;
+    }
+}
+
 route[HANDLE_MESSAGE]
 {
     if (is_method("MESSAGE")) {