NEC SL1000 Features And Specifications Manual page 301

ISSUE 2.0
2. Dial 728.
You hear confirmation tone.
3. Hang up.
To Enable DND at a room telephone:
Normally, only the supervisor's station has this ability.
1. Lift the handset.
2. Dial 729.
3. Dial the number of the extension for which you want to enable DND.
You hear confirmation tone.
4. Hang up.
To Cancel DND enabled at another room telephone:
Normally, only the supervisor's station has this ability.
1. Lift the handset.
2. Dial 730.
3. Dial the number of the extension for which you want to disable DND.
You hear confirmation tone.
4. Hang up.
Features and Specifications Manual
SL1000/SL1100
H
1-291