Refer to the exhibit. 
You have received a trouble ticket that users cannot place calls to the PSTN.
During testing you discover the gateway is not switching to the secondary call agent when the
primary call agent is unreachable.
What needs to be done to allow the MGCP gateway to use a different call agent if the primary
fails?
A.
The ccm-manager fallback-mgcp command needs to be added to the gateway.
B.
The ccm-manager redundant-host command needs to be added to the gateway.
C.
A Cisco Unified CallManager group that includes the secondary call agent needs to be
assigned to the gateway.
D.
The gateway needs to be defined as a non-gatekeeper-controlled intercluster trunk with the
secondary Cisco Unified CallManager defined.
Explanation:
Given the presence of command
ccm-manager config server 10.1.5.2
ccm-manager config
thats mean that the MGCP points to CCM to download it’s config–> A second CUCM that include
the secondary call agent.