diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index 8635a29..36fdf85 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -60,6 +60,7 @@
 	decode_dtap := false,
 	role_ms := false,
 	protocol := RAN_PROTOCOL_BSSAP,
+	use_osmux := false,
 	sccp_addr_local := omit,
 	sccp_addr_peer := omit
 }