In general, a night service is any service that operates at night, such as a night-time public transport service or a 24-hour telephone support service. Night service in particular is also a feature of private branch exchanges and business telephone systems, whereby for a set period during the day (usually those hours outside of normal office or w...
Found on
http://en.wikipedia.org/wiki/Night_service
The period outside normal working hours when the switch is either directing or overflowing calls to another answering point, frequently a voice mail system, answering service / machine or night operator. When a switch is put into night service the ringing system is often changed to reflect this.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.
