AT&T MERLIN LEGEND Release 2.0 MLX Queued Call Console Operator's Manual page 115

Features
Overriding Outside Call Restriction on
Night Service
Your company can program Night Service to restrict the use
of telephones for outside calls when Night Service is
activated. When this happens, you can override the
restriction as follows.
1. Without lifting the handset, press Hold.
2. Dial the override password.
3. Lift the handset.
4. Dial the outside number as you would during work
hours.
NOTE:
Numbers programmed as Night Service emergency
numbers can be dialed without a password.
4-42 Night Service