Which three functions are associated with MGCP?

Which three functions are associated with MGCP? (Choose three.)
A. Control is implemented by a series of plain-text commands that are sent over UDP port 2427 betweenCisco Unified Communications Manager and the gateway.
B. A PRI backhaul channel forwards PRI Layer 2 (Q.921) signaling information via a TCP connection fromthe gateway to the call agent.
C. MGCP uses a separate channel for backhauling signaling information between the call agent and the gateway.
D. The gateway maintains a separate dial plan for redundancy in case the call agent fails.
E. Users query the call agent to determine the location of the call recipient.
F. A call agent uses control messages to direct its gateways and their operational behavior.

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