This object specifies the protocol port of the Media Gateway
Controller (MGC).
If the value of cmgwSignalProtocol is 'mgcp(2)' or 'tgcp(4)'
and the value of cmgwSignalProtcolVersion is '1.0', the
default value of this object is '2427'.
If the value of cmgwSignalProtocol is 'h248(3)' and the
value of cmgwSignalProtcolVersion is '1.0', the default
value of this object is '2944'.