Which three functions are associated with MGCP?

Correct Answer for the Question – Which three functions are associated with MGCP? is given below

Which three functions are associated with MGCP? (Choose three.)Explanation: MGCP is a plain-text protocol used by call-control devices to manage IP Telephony gateways.MGCP is a master/slave protocol that allows a call control device to take control of a specific port on agateway. With this protocol, the Cisco CallManager knows and controls the state of each individual port onthe gateway. It allows complete control of the dial plan from Cisco CallManager, and gives CallManagerper-port control of connections to the PSTN, legacy PBX, voice mail systems, POTS phones and so forth.This is implemented with the use of a series of plain-text commands sent over User Datagram Protocol(UDP) port 2427 between the Cisco CallManager and the gateway.Another concept relevant to the MGCP implementation with Cisco CallManager is PRI Backhaul. Thisoccurs when Cisco CallManager takes control of the Q.931 signaling data used on an ISDN PRI. The onething that distinguishes a PRI from other interfaces is the fact that the data that is received from the PSTNon the D-channel and needs to be carried in its raw form back to the Cisco CallManager to be processed.The gateway does not process or change this signaling data, it simply passes it onto the Cisco CallManagerthrough TCP port 2428. The gateway is still responsible for the termination of the Layer 2 data. That meansthat all the Q.921 data-link layer connection protocols are terminated on the gateway, but everything abovethat (Q.931 network layer data and beyond) is passed onto the Cisco CallManager. This also means thatthe gateway does not bring up the D-channel unless it can communicate with Cisco CallManager tobackhaul the Q.931 messages contained in the D-channel.8Cisco 642-437 Examhttp://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00801da84e.shtml

Control is implemented by a series of plain-text commands that are sent over UDP port 2427 betweenCisco Unified Communications Manager and the gateway.

A PRI backhaul channel forwards PRI Layer 2 (Q.921) signaling information via a TCP connection fromthe gateway to the call agent.

MGCP uses a separate channel for backhauling signaling information between the call agent and the gateway.

The gateway maintains a separate dial plan for redundancy in case the call agent fails.

Users query the call agent to determine the location of the call recipient.

A call agent uses control messages to direct its gateways and their operational behavior.

Correct Answer

The Correct Answer for this Question is

Control is implemented by a series of plain-text commands that are sent over UDP port 2427 betweenCisco Unified Communications Manager and the gateway.
MGCP uses a separate channel for backhauling signaling information between the call agent and the gateway.
A call agent uses control messages to direct its gateways and their operational behavior.

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