Night service (telephony)

Night service in telephony is a feature of

In systems without direct inward dial capability, all calls for a large organisation originally were placed to the facility's main number, where a switchboard operator or attendant would ask which extension or department the caller intended to reach. The call would then be transferred manually. As soon as the front office closed for the day, the system would be unusable for inbound calls.

Night service would redirect after-hours calls to a desk where personnel remained on duty overnight, such as a

• "Overview of DPNSS Features". Cisco. Retrieved September 3, 2005.
• "Survey of Telephone Switching". Telephone Tribute. Retrieved September 3, 2005.