AT&T MERLIN LEGEND Key System Planning page 127

Features
Night Service with
Outward Restriction
Any call that comes in to the operator console while Night Service is in effect
rings immediately at each available telephone in the group. Calls ring
immediately even on lines set for delayed ring or no ring.
You can create up to eight Night Service groups, one for each operator. There is
no limit to the number of telephones assigned to each group, and each
telephone can be assigned to more than one group.
Planning Form Instructions
Record your decisions on Key System Form 7a, Night Service — Group
Assignment.
Note: Form 7a has two sides and accomodates information for up to eight
operators.
In each column:
1.
Write the extension number for the operator whose calls are being
answered in the "Operator Ext. No." space. (Refer to Form 2a).
2 .
Write the extension number for each member of the group in the "Ext. No."
column. (Refer to Form 2a).
3 . Write each group member's name in the "Name" column. (Refer to
Form 2a).
The Night Service with Outward Restriction option allows you to setup the
system so that only authorized users can place non-emergency calls when
Night Service is in effect. This prevents unauthorized after-hours use of
telephones.
When you select this option, people who need to make calls after hours must
first enter a password. People who do not know the password can dial only
emergency numbers that you specify, such as the telephone numbers for the
police and fire departments. Calls to non-emergency numbers do not go
through unless the password is entered first. You can include up to 10
telephone numbers on the Night Service Emergency Allowed List. Each number
can have a maximum of 12 digits.
Once you specify that a password is required, the password applies to all
telephones in the system when Night Service is activated at any operator
position.
If users need to make after-hours calls and prefer not to enter a password, you
can set up an Exclusion List that excludes those users from the password
requirement. Telephones assigned to the Exclusion List keep the normal call
restrictions, if any are assigned, when Night Service is in effect. However, these
telephones are not protected in any other way from unauthorized after-hours
use.
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System Features