When all attendants of an attendant group have activated night mode, the Group Night Service is active. The displays and keys are as CNS above.

This feature can be split into different requirements and their solutions.

When an AC group is night service (GNS) local extension calls shall always follow the GNS destination.

Group night service for trunk calls (GNS). Trunks follow the GNS destination where no individual night answer point is defined for the trunk as in the case for extension calls.

Trunk night service (TNS see below) If set for the system will override GNS.

Incoming CO calls in a break-in node automatically routed to a remote AC group use the centralised attendant functionality (CAC). On encountering the remote attendant group in night service the break -in node is informed of the night status of the CAC and the GNS answer point. The decision as to which night answer point to route to is made in the break-in node i.e follow the GNS of the CAC or route to the TNS destination of the incoming trunk.

If trunk night service is active (ZAND:ATND- INIGHT=YES) in the centralized attendant switch, centralized attendant has night mode activated and rerouting is permitted, all calls will be diverted to the assigned night destination by rerouting to the originating switch.

The counter for CAS-diversions (ZAND: CACFWMAX) will be checked and incremented also for night diversions to internal centralized attendant.