An engineer must configure an MGCP gateway and register it to Cisco Unified Communications Manager. Which prerequisite must be met before applying the gateway commands to enable MGCP?
A.
The MGCP gateway and the Cisco Unified CM must be able to communicate aver ports 5060 and 5061.
B.
Cisco Unified CM and the MGCP gateway must utilize the SIP OPTIONS ping feature to monitor status.
C.
The MGCP gateway must have voice service VoIP configured.
D.
The MGCP gateway and the Cisco Unified CM must be able to communicate over ports 2427, 2428, and 2727.
This is the only place I can find mention of port 2727: https://community.cisco.com/t5/collaboration-voice-and-video/mgcp-gateway-integration-with-cucm-and-pstn-service-provider/ta-p/3116588
It appears D is correct.
MGCP Fundamentals
The Media Gateway Control Protocol (MGCP) is defined by RFC 2705. MGCP is a master/slave protocol, where the Endpoint (Slave) is controlled by a Call Agent (Master) of some type. The entire control intelligence is controlled by a Master who instructs the endpoint what action to take once an event is detected. MGCP uses TCP port 2428 and UDP port 2427.
TCP port 2428 in MGCP is used to open a new socket with the Call Agent to determine if the connection can be established. Without this new socket, subsequent MGCP Messages cannot be exchanged. It is also used to Send/Receive Backhaul Messages between PRI Endpoints and the Call Agent it is registered to. Finally, TCP port 2428 is used to failover to backup Call Agents in the event a Primary Call Agent is unresponsive.UDP Port 2427 in MGCP is used for MGCP Messages exchanged between the Endpoints and the Call Agents.
Basic Flow
Prerequisites: For the configuration to work, the following prerequisites must be met.
MGCP Gateway and the CUCM TFTP server must have IP connectivity between each other. It’s important to ensure that TCP and UDP ports 2427, 2428 and 2727 can communicate between the MGCP gateway and CUCM TFTP server. If there is a firewall then ensure these ports are enabled.
MGCP gateway and endpoints are configured in CUCM. Configuration has been saved and the Reset have been applied.
Host name or fully qualified domain name (FQDN) of the Cisco IOS MGCP gateway much match the CUCM MGCP gateway configuration. If the router’s running configuration file has the <ip domain-name> command in it, an FQDN must be used , example : router1.highpoint.com
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