All incoming calls on Night Service trunk groups go to the trunk group’s NSE unless the trunk group member has its own Trunk Group Member Night Destination, in which case the calls are redirected to that destination instead of the trunk group’s NSE.

Calls already in progress on a trunk group (such as talking, on hold, or waiting in queue), are unaffected when the individual Trunk Group Night Service or System Night Service is activated.

Trunk Group Night Service and System Night Service work independently of one another.

• When a user activates System Night Service, any trunks that are controlled by individual Trunk Group Night Service buttons remain in day service. Trunk groups that are not currently assigned to Trunk Group Night Service are assigned to System Night Service.

• Trunks with individual Trunk Group Night Service can be removed from Night Service even though the rest of the system remains in Night Service.

• When a user deactivates System Night Service, any trunks that have individual Trunk Group Night Service still active remain in night service.

• Trunks with individual Trunk Group Night Service can be placed into Night Service even though the rest of the system remains in day service.

If a trunk is added to a trunk group while that trunk group is in Trunk Group Night Service, the trunk is brought up in night service.

Individual Trunk Group Night Service does not apply to DID trunk groups.

If Night Service is activated for a trunk group, and a power failure occurs, the trunk group automatically returns to the Night Service mode.

If for some reason, a phone with a trunk-ns button remains out of service after a system reboot and later comes back in service, the trunk-ns lamp shows the trunk status within 10 seconds of coming back in service. For example, a telephone with a trunk-ns button might be unplugged when the system is rebooted. If the phone is plugged back in later, the trunk status is shown on the trunk-ns button within 10 seconds.