Which command is used to determine if an MGCP gateway is registered with a Cisco Unified Communications Manager server?

Which command is used to determine if an MGCP gateway is registered with a Cisco Unified
Communications Manager server?

A.
show gateway status

B.
show isdn q931

C.
show ccm-manager

D.
show isdn status

E.
show isdn q921

Explanation:

Router# show ccm-manager
MGCP Domain NamE. router.cisco.com
Total number of host: 2
Priority Status Host
===================================================
Primary Registered 10.0.0.201
First backup Backup polling 10.0.0.50
Second backup Undefined
Current active Communications Manager: 10.0.0.201
Current backup Communications Manager: 10.0.0.50
Redundant link port: 2428
Failover Interval: 30 seconds
Keepalive Interval: 15 seconds
Last keepalive sent: 00:20:18 (elapsed timE. 00:00:06)
Last MGCP traffic timE. 00:20:18 (elapsed timE. 00:00:06)
Last switchover timE. None
Switchback modE. Immediate

Link: http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf1.html#wp1027388