diff --git a/tests/mgcp_client/mgcp_client_test.ok b/tests/mgcp_client/mgcp_client_test.ok
index 8fbe3ae..8b3e15b 100644
--- a/tests/mgcp_client/mgcp_client_test.ok
+++ b/tests/mgcp_client/mgcp_client_test.ok
@@ -100,6 +100,14 @@
 M: sendrecv
 X-Osmux: 2
 
+Generate X-Osmo-Osmux message (MDCX):
+MDCX 17 23@mgw MGCP 1.0
+C: 2f
+I: 11
+L: p:20, a:GSM, nt:IN
+M: sendrecv
+X-Osmux: 2
+
 Overfolow test: