diff --git a/kamailio/authorization.cfg b/kamailio/authorization.cfg
index 0dfbf4c..e409bd6 100644
--- a/kamailio/authorization.cfg
+++ b/kamailio/authorization.cfg
@@ -79,6 +79,11 @@ route[AUTHORIZATION_CHECK_REGISTERED]
 route[HANDLE_AUTHORIZATION]
 {
 
+    if (isflagset(FLAG_INTERNALLY_SOURCED)) {
+        route(MAIN);
+        exit;
+    }
+
     if(!is_present_hf("Proxy-Authorization")) {
         route(MAIN);
         exit;
diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index 7c2ba8e..1a41916 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -251,9 +251,10 @@ route
 
 route[MAIN]
 {
-    route(AUTHORIZATION);
-
-    remove_hf("Authorization");
+    if (!isflagset(FLAG_INTERNALLY_SOURCED)) {
+        route(AUTHORIZATION);
+        remove_hf("Authorization");
+    }
 
     #!ifdef MESSAGE_ROLE
     route(HANDLE_MESSAGE);