AT&T MERLIN LEGEND Release 2.0 Analog Direct-Line Console Operator's Manual page 89

Features
To Program a Night Service Button
1. Label the button to be programmed as Night Service.
2. Slide the T/P switch to the P position.
3. Press the button you labeled Night Service.
4. Dial *39.
5. Slide the T/P switch to the center position.
To Use Night Service
1. Press the programmed Night Service button.
If you do not need a password, the green light next to the button is
on or off to indicate whether Night Service is on or off. If a password
is required, the green light flashes
2. Dial the password, if required.
The green light now turns on if it had been off, turns off if it had been
on.
NOTE:
You must complete the password within 60 seconds or
start the procedure again. If you make a mistake when
entering a password, the light next to the Night Service
button returns to its previous state.
4-40 Night Service