This object specifies whether the MID should be a
combination of the transport port number and the
domain name represented by cmedGatewayPort and
cmedxGatewayDomainName respectively, when
cmedxGatewayHeaderAddrType is 'dns' .
A value of 'true' indicates that the MID will be a
combination of the domain name and the transport port
number.
A value of 'false' indicates that MID will contain
only the domain name and not the port number.
The agent won't allow any attempt to set this object
for other address types.