mgcp-cli: Allow submitting X-Osmux on MDCX request

Change-Id: I41243f3ed212ace6087d5b0341e3a52f4069e37d
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: