Definitions for "NIGHT SERVICE"
An arrangement allowing an answering agency to close its operations and have all 9-1-1 calls to it forwarded to a pre-selected alternate agency.
During the specified hours, the ability to provide notification to designated phones that a particular extension on a different phone is ringing.
Most telephone systems have at least two operating modes, Day service and Night Service. These are typically used to route incoming calls to a different destination and to apply call barring to prevent unauthorised use of the phones by security or cleaning staff.