AT&T MERLIN LEGEND System Reference Manual page 294

Features
Feature Interactions
Automatic Route Selection
Calling Restrictions
Direct-Line Console
Display
There can be up to eight Night Service groups, one for each system operator
and there is no limit to the number of telephones assigned to each group. A
telephone can be a member of more than one group.
An answering machine connected to a 012 module can be setup as a
member of a Night Service group to automatically answer after-hours calls.
External alerts such as strobes, bells, or chimes can be connected to an
analog multiline telephone by using a Supplemental Alert Adapter (SAA) or to
an MLX telephone by using a Multi-Function Module (MFM) that is a member
of a Night Service group. The external alert sounds or lights when a Night
Service call comes into that telephone.
When Night Service with Outward Restriction is used, a system operator
must enter a password to manually activate or deactivate Night Service.
When Night Service with Outward Restriction is programmed, the user must
enter the password before dialing the ARS dial-out code unless the telephone is
assigned to an Exclusion List or the number is on an Emergency Numbers List.
For Night Service with Outward Restriction, a Night Service Emergency
Numbers List must be created consisting of emergency numbers that can be
dialed from any telephone without dialing the password. Any restrictions
assigned to a telephone assigned to the exclusion list are in effect when Night
Service is activated.
On a system with 30 lines or fewer, a Night Service button is factory assigned to
analog DLCs with 34 buttons or more. On a system with more than 30 lines, the
Night Service button is replaced with line 31. A Night Service button is factory
assigned to an MLX-28D used as a DLC, regardless of the number of
lines/trunks connected to the system. The Night Service button is not a fixed
feature and can be assigned to any available button on either an analog or MLX
DLC.
When a DLC system operator with an MLX telephone activates Night Service by
using a programmed button, a message appears on the display. If the system
operator must enter a password to turn Night Service on and off, the display
prompts the operator for the password. No message is displayed when the
system operator activates Night Service by using a feature code or when Night
Service is off.
If an MLX display telephone is in the test mode, and a Night Service call arrives
and the user exits the test mode while the call is still ringing, the call rings at the
telephone. However, the calling information is not displayed. The user must
press the Home button to see the call information.
Night Service 2-245