diff --git a/library/OSMUX_Emulation.ttcn b/library/OSMUX_Emulation.ttcn
index d31a562..5d9a95e 100644
--- a/library/OSMUX_Emulation.ttcn
+++ b/library/OSMUX_Emulation.ttcn
@@ -54,6 +54,7 @@
 import from General_Types all;
 import from Osmocom_Types all;
 import from IPL4asp_Types all;
+import from Misc_Helpers all;
 import from OSMUX_Types all;
 import from OSMUX_CodecPort all;
 import from OSMUX_CodecPort_CtrlFunct all;
@@ -289,26 +290,26 @@
 	/* Check if there was some activity at either on the RX or on the
 	 * TX side, but complete silence would indicate some problem */
 	if (s.num_pkts_tx < 1 and s.num_pkts_rx < 1) {
-		setverdict(fail, "no Osmux packet activity detected (packets)");
-		mtc.stop;
+		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+					"no Osmux packet activity detected (packets)");
 	}
 	if (s.bytes_payload_tx < 1 and s.bytes_payload_rx < 1) {
-		setverdict(fail, "no Osmux packet activity detected (bytes)");
-		mtc.stop;
+		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+					"no Osmux packet activity detected (bytes)");
 	}
 
 	/* Check error counters */
 	if (s.num_pkts_rx_err_seq != 0) {
-		setverdict(fail, "Osmux packet sequence number errors occurred");
-		mtc.stop;
+		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+					"Osmux packet sequence number errors occurred");
 	}
 	if (s.num_pkts_rx_err_disabled != 0) {
-		setverdict(fail, "Osmux packets received while RX was disabled");
-		mtc.stop;
+		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+					"Osmux packets received while RX was disabled");
 	}
 	if (s.num_pkts_rx_err_payload != 0) {
-		setverdict(fail, "Osmux packets with mismatching payload received");
-		mtc.stop;
+		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+					"Osmux packets with mismatching payload received");
 	}
 }
 
@@ -336,8 +337,9 @@
 			return RxHandleTable[i].vc_conn;
 		}
 	}
-	setverdict(fail, "No Component for CID ", cid);
-	mtc.stop;
+	Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+				log2str("No Component for CID ", cid));
+	return RxHandleTable[0].vc_conn; /* make compiler happy, not reached */
 }
 
 private function f_rxhandle_cid_add(OsmuxRxHandle hdl) runs on OSMUX_Emulation_CT {
@@ -349,8 +351,8 @@
 			return;
 		}
 	}
-	testcase.stop("No Space in RxHandleTable for ", hdl.cid);
-	mtc.stop;
+	Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+				log2str("No Space in RxHandleTable for ", hdl.cid));
 }
 
 private function f_txhandle_cid_add(OsmuxTxHandle hdl) runs on OSMUX_Emulation_CT {
@@ -361,8 +363,8 @@
 			return;
 		}
 	}
-	testcase.stop("No Space in TxHandleList for ", hdl.cid);
-	mtc.stop;
+	Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+				log2str("No Space in TxHandleList for ", hdl.cid));
 }
 
 function f_osmux_gen_expected_rx_rtp_payload(INT4b amr_ft, octetstring tx_fixed_payload) return octetstring {
@@ -459,8 +461,8 @@
 			res := OSMUX_CodecPort_CtrlFunct.f_IPL4_listen(OSMUX, g_local_host,
 								g_local_port, {udp:={}});
 			if (not ispresent(res.connId)) {
-				setverdict(fail, "Could not listen on Osmux socket, check your configuration");
-				mtc.stop;
+				Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+							"Could not listen on Osmux socket, check your configuration");
 			}
 			g_osmux_conn_id := res.connId;
 			tr_osmux_amr.connId := g_osmux_conn_id;
@@ -474,8 +476,8 @@
 								g_local_host, g_local_port,
 								g_osmux_conn_id, {udp:={}});
 			if (not ispresent(res.connId)) {
-				setverdict(fail, "Could not connect to Osmux socket, check your configuration");
-				mtc.stop;
+				Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+							"Could not connect to Osmux socket, check your configuration");
 			}
 			g_tx_connected := true;
 			CTRL.reply(OsmuxEM_connect:{g_remote_host, g_remote_port});
@@ -569,8 +571,8 @@
 
 		/* fail on any unexpected messages */
 		[] OSMUX.receive {
-			setverdict(fail, "Received unexpected type from Osmux");
-			mtc.stop;
+			Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
+						"Received unexpected msg type from Osmux");
 		}
 	}
 	}