When there are no calls, how many TCP and UDP connections exist on a Cisco IOS MGCP PRI gateway servicing a two-node UCM cluster configured with call processing redundancy?
In a Cisco IOS MGCP PRI gateway, the TCP connections are used for signaling and control messages, while the UDP connections are used for transporting voice traffic.
In a two-node UCM cluster configured with call processing redundancy, there are two UCM servers that share the same configuration and database. One server serves as the active call processing node, while the other serves as the standby node. In the event of a failure of the active node, the standby node takes over call processing.
When there are no calls, the MGCP PRI gateway maintains a single TCP connection to the active call processing node, which is used for exchanging signaling and control messages. The standby call processing node does not have an active TCP connection with the MGCP PRI gateway.
Additionally, there is a single UDP connection between the MGCP PRI gateway and the active call processing node, which is used for transporting voice traffic.
Therefore, the correct answer is D. One TCP connection and one UDP connection.