diff --git a/bsc-nat/BSC_MS_ConnectionHandler.ttcn b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
index ee56401..a385525 100644
--- a/bsc-nat/BSC_MS_ConnectionHandler.ttcn
+++ b/bsc-nat/BSC_MS_ConnectionHandler.ttcn
@@ -66,6 +66,7 @@
 	BSC_STATE_WAIT_ASS_REQ,
 	BSC_STATE_WAIT_CRCX,
 	BSC_STATE_WAIT_MDCX,
+	BSC_STATE_WAIT_MDCX2,
 	BSC_STATE_WAIT_CLEAR_CMD,
 	BSC_STATE_WAIT_DLCX,
 	BSC_STATE_WAIT_DISC_IND
@@ -116,7 +117,15 @@
 		/* MDCX -> OK */
 		[g_state == BSC_STATE_WAIT_MDCX] BSSAP.receive(tr_MDCX) -> value mgcp_cmd {
 			/* FIXME: verify if local part of endpoint name matches CIC */
-			/* respond with CRCX_ACK */
+			/* respond with MDCX_ACK */
+			g_state := BSC_STATE_WAIT_MDCX2;
+			BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
+			}
+
+		/* MDCX -> OK */
+		[g_state == BSC_STATE_WAIT_MDCX2] BSSAP.receive(tr_MDCX) -> value mgcp_cmd {
+			/* FIXME: verify if local part of endpoint name matches CIC */
+			/* respond with MDCX_ACK */
 			g_state := BSC_STATE_WAIT_CLEAR_CMD;
 			BSSAP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, g_mgcp_conn_id, g_sdp));
 			}