diff --git a/include/osmocom/mgcp_client/mgcp_client_fsm.h b/include/osmocom/mgcp_client/mgcp_client_fsm.h
index e170a25..c763d74 100644
--- a/include/osmocom/mgcp_client/mgcp_client_fsm.h
+++ b/include/osmocom/mgcp_client/mgcp_client_fsm.h
@@ -48,6 +48,11 @@
 	 * name than the BSC. An OsmoMGW will then ignore these and not fail on mismatches. */
 	uint32_t x_osmo_ign;
 
+	/*! send 'X-Osmux: %d' header (or "*" as wildcard). */
+	bool x_osmo_osmux_use;
+	/*! -1 means send wildcard. */
+	int x_osmo_osmux_cid;
+
 	/*! If left MGCP_CONN_NONE, use MGCP_CONN_RECV_ONLY or MGCP_CONN_RECV_SEND, depending on whether an audio RTP
 	 * address is set. If != MGCP_CONN_NONE, force this conn mode. */
 	enum mgcp_connection_mode conn_mode;