Which statement indicates something that can cause an inbound PSTN call to an H.323 gateway
that is configured in Cisco Unified Communications Manager to fail to ring an IP Phone?

A.
The gateway is not registered in Cisco Unified Communications Manager.

B.
The gateway IP address that is configured in Cisco Unified Communications Manager does not
match the IP address that is configured at the gateway in the h323-gataway voip bind srcaddr
command.

C.
The Cisco Unified Communications Manager does not have a matching route pattern to match
the called number.

D.
The gateway is missing the command allow-connections h323 to h323 under the voice service
voip configuration.