diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index f157c5b..1e931c3 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -398,6 +398,7 @@ route[HANDLE_IN_DIALOG_REQUESTS]
 {
     if (has_totag()) {
         if (is_method("INVITE")) {
+            setflag(FLAG_SESSION_PROGRESS);
             record_route();
         }
         if (loose_route()) {