diff --git a/scenarios_pbx/invite_xfer_blind_callee_immediat_rel/prefs.json.tt2 b/scenarios_pbx/invite_xfer_blind_callee_immediat_rel/prefs.json.tt2
new file mode 100644
index 00000000..f91373fa
--- /dev/null
+++ b/scenarios_pbx/invite_xfer_blind_callee_immediat_rel/prefs.json.tt2
@@ -0,0 +1,5 @@
+{
+  "@invite-xfer-blind-callee-immediat-rel.scenarios-pbx.test": {
+    "nat_sipping": "no"
+  }
+}
diff --git a/scenarios_pbx/invite_xfer_blind_caller_immediat_rel/prefs.json.tt2 b/scenarios_pbx/invite_xfer_blind_caller_immediat_rel/prefs.json.tt2
new file mode 100644
index 00000000..9d9fb6b8
--- /dev/null
+++ b/scenarios_pbx/invite_xfer_blind_caller_immediat_rel/prefs.json.tt2
@@ -0,0 +1,5 @@
+{
+  "@invite-xfer-blind-caller-immediat-rel.scenarios-pbx.test": {
+    "nat_sipping": "no"
+  }
+}