AT&T MERLIN LEGEND Release 2.0 MLX Direct-Line Consoles Operator's Manual page 108

Features
To Override Outside Call Restriction
on Night Service
Your company can program Night Service to restrict the use
of telephones for outside calls if 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 which are programmed into the system's Night
Service emergency list can be dialed without a password.
This list of numbers can include up to ten telephone
numbers, with a maximum of 12 digits each.
4-40
Night Service