diff --git a/bsc-nat/BSC_MS_ConnectionHandler.ttcn b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
index 876d2ec..6efb15b 100644
--- a/bsc-nat/BSC_MS_ConnectionHandler.ttcn
+++ b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
@@ -50,7 +50,9 @@
 
 const BssmapOps BSC_MS_BssmapOps := {
 	create_cb := refers(CreateCallback),
-	unitdata_cb := refers(UnitdataCallback)
+	unitdata_cb := refers(UnitdataCallback),
+	decode_dtap := false,
+	role_ms := true
 }
 
 
diff --git a/bsc-nat/MSC_ConnectionHandler.ttcn b/bsc-nat/MSC_ConnectionHandler.ttcn
index b038ce5..0a06759 100644
--- a/bsc-nat/MSC_ConnectionHandler.ttcn
+++ b/bsc-nat/MSC_ConnectionHandler.ttcn
@@ -56,7 +56,9 @@
 
 const BssmapOps MSC_BssmapOps := {
 	create_cb := refers(CreateCallback),
-	unitdata_cb := refers(UnitdataCallback)
+	unitdata_cb := refers(UnitdataCallback),
+	decode_dtap := false,
+	role_ms := false
 }
 
 type enumerated MSC_State {