Cisco Unified Communications Manager MGCP Gateway Keepalive Message

D.

(2xx) Successful completion: The requested transaction was executed normally.

The correct answer is "C. NTFY."

When a Cisco IOS MGCP gateway establishes a connection with a Cisco Unified Communications Manager (CUCM), it sends periodic keepalive messages to ensure the connection is still active. In response, CUCM sends a notification message (NTFY) to the MGCP gateway to acknowledge receipt of the keepalive and to indicate that the connection is still active.

The NTFY message is part of the MGCP protocol, which is used to control media gateways in a VoIP network. The NTFY message is sent by the Call Agent (CUCM) to the Media Gateway Controller (MGC) ( Cisco IOS MGCP Gateway) to notify it of a change in call state, such as an on-hook or off-hook event, or to acknowledge receipt of a keepalive message.

The other options listed are not correct:

• AUEP (Audit Endpoint) is used to request information about the state of an endpoint or to modify its configuration.
• RQNT (Request Notification) is used to request that the MGCP gateway send a notification when a specific event occurs, such as an on-hook or off-hook event.
• 200 is an HTTP status code indicating that a request was successful.
• AUCX (Audit Connection) is used to request information about the state of the MGCP connection or to modify its configuration.

Therefore, the correct answer is NTFY.