If you look at CM Help page, (screen shot attached) it says that MGCP Listen Port 2427 in Callmanager is a TCP port (not UDP). So is MGCP really using UDP or TCP ?
Also it mentions a Keepalive port, again uses TCP port number 2428. What is this port used for ? This does match with the backhaul port..
Configuration of MGCP gateway - In the configuration of MGCP gateway you specifiy the command "mgcp call-agent <ip add> <port> <blah>". To configure MGCP on a cisco router to work with Cisco callmanager you specify the port as 2427. This means that the router will talk to the callagent on port 2427. This conflicts with the ports specified in RFC 2705. RFC 2705 says that communication from callagent to gateways use port 2427.
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