This object specifies the address of MGC (call agent)
the gateway used to communicate with in call setup.
This object cXgcpMgcConfigAddress and object
cXgcpMgcConfigMgcGrpNum are mutually exclusive.
The object cXgcpMgcConfigAddress can be set only when
the object cXgcpMgcConfigMgcGrpNum is equal to 0.
Otherwise, the SET will be rejected with error.