msc: Introduce Osmux infra and one test for osmo-msc

Change-Id: Ibcb82d1a2d570c6c0ad0c3b6504bffe2244eccd9
diff --git a/library/MGCP_Templates.ttcn b/library/MGCP_Templates.ttcn
index 4736aaa..dae379e 100644
--- a/library/MGCP_Templates.ttcn
+++ b/library/MGCP_Templates.ttcn
@@ -198,6 +198,7 @@
 	}
 
 	template MgcpResponse ts_MDCX_ACK(MgcpTransId trans_id, MgcpConnectionId conn_id, template SDP_Message sdp := omit) := ts_CRCX_ACK(trans_id, conn_id, sdp);
+	template MgcpResponse ts_MDCX_ACK_osmux(MgcpTransId trans_id, MgcpConnectionId conn_id, MgcpOsmuxCID osmux_cid, template SDP_Message sdp := omit) := ts_CRCX_ACK_osmux(trans_id, conn_id, osmux_cid, sdp);
 
 	/* have a function that generates a template, rather than a template in order to handle
 	 * optional parameters */