The members of the night service group are used as the destination for most external calls when the system is in night service.

When the system is put into night service, the Coverage Destinations of all trunks and trunk channels are overridden. Instead all calls to which the Coverage Destination would have been applied are present to the users in the night service group. The only exception are calls routed to specific destinations by DID call mapping or Call-by-Call settings.

The group is a Ring All groups, that is a call to the group will alert all the available group members (those not already on a call) until the call is answered.

Any ring delays on trunks are ignored. Instead calls redirected to the Night Service Group members alert immediately.

If a system password is set, users in the Night Service Group need to enter that number when dialing external calls. The only exception is if dialing numbers in the Emergency Numbers list and marked system speed dials. No additional outgoing call restrictions are applied to any users not in the Night Service Group.