When a Media Gateway fails-over to a survivable core server any attendant console in that media gateway will come into service in the Night Service mode. Calls can be taken from the attendant console after the console is taken out of Night Service. Only the trunks under the control of the servicing survivable core server will be affected by the deactivation of the Night Service mode. The survivable core server assumes that any console that it cannot control is out of service.