NEC SL1000 Features And Specifications Manual page 206

SL1000
Operation
To activate or deactivate Do Not Disturb while your extension is idle:
Multiline Terminal Using Feature Key or Access Code
1. Do not lift the handset.
2. Press the DND feature key programmed in (Program15-07-01 or SC:851 :03).
- OR -
Press Speaker and dial 847 .
3. Dial the DND option code.
0 = Cancel DND
D
1 = Incoming Trunk Calls Blocked
2 = Paging, incoming Intercom, Call Forwards and Transferred Trunk Calls Blocked
3 = All Calls Blocked
4 = Call Forwards Blocked
5 = Room Monitor Blocked
Single Line Telephone
1. Lift the handset.
2. Dial 847 .
3. Dial the DND option code.
0 = Cancel DND
1 = Incoming Trunk Calls Blocked
2 = Paging, Incoming Intercom, Call Forwards and Transferred Trunk Calls Blocked
3 = All Calls Blocked
4 = Call Forwards Blocked
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ISSUE 1.0
Do Not Disturb (DND)