NEC SL1100 Features And Specifications Manual page 185

ISSUE 2.0
2. Dial 601 (default).
3. Dial the 4-digit Supervisor Dial Block code (as set in programming).
4. Dial the extension number to blocked.
5. Dial 1.
Confirmation tone is heard.
6. Press Speaker key or replace the handset to hang up.
To release Dial Block from another extension:
1. At the Multiline Terminal, press Speaker key.
- OR -
At the Single Line Terminal, lift the handset.
2. Dial 601.
3. Dial the 4-digit Supervisor Dial Block code.
4. Dial the extension number to be released from Dial Block.
5. Dial 0.
Confirmation tone is heard.
6. Press Speaker key or replace the handset to hang up.
Features and Specifications Manual
SL1100
C
1-173