diff --git a/library/MGCP_Templates.ttcn b/library/MGCP_Templates.ttcn
index 9e32a34..e509da8 100644
--- a/library/MGCP_Templates.ttcn
+++ b/library/MGCP_Templates.ttcn
@@ -124,6 +124,16 @@
 		sdp := *
 	}
 
+	template MgcpResponse tr_MDCX_ACK := {
+		line := {
+			code := "200",
+			trans_id := ?,
+			string := "OK"
+		},
+		params := *,
+		sdp := ?
+	}
+
 	template MgcpResponse ts_MDCX_ACK(MgcpTransId trans_id, MgcpConnectionId conn_id, template SDP_Message sdp := omit) := ts_CRCX_ACK(trans_id, conn_id, sdp);
 
 	/* have a function that generates a template, rather than a template in order to handle