You are a network technician working in the Network Company. Recently, users complain that they cannot call the PSTN. With the help of testing, you find that the gateway is not switching to the secondary call agent when the primary call agent is unreachable. In order to permit the MGCP gateway to take use of a different call agent once the primary fails, which configuration should you make?
A. Add ccm-manager fallback-mgcp command to the gateway.
B. Add ccm-manager redundant-host command to the gateway
C. Assign a Cisco Unified CallManager group including the secondary call agent to the gateway
D. Define gateway as a non-gatekeeper-controlled intercluster trunk with the secondary Cisco Unified CallManager defined.
