NEC Univerge SV8100 Features And Specifications Manual page 232

Issue 12.0
To cancel Call Forwarding Off-Premise non-split:
1. At a multiline terminal, press Speaker.
- OR -
At a single line telephone, lift the handset.
2. Dial the Call Forward Access Code (default not assigned).
3. Dial 0 (Cancel).
To activate Call Forwarding Off-Premise Split:
1. At a multiline terminal, press Speaker.
- OR -
At a single line telephone, lift the handset.
2. Dial the Call Forwarding Service Code.
3. Dial 1 (Set).
4. Dial 1 (Internal) or 0 (External).
5. Dial Trunk Access Code (default: 9) + number (9 + 2142622000).
 Trunk access codes are 9 (ARS/Trunk Group Routing), 704 + Line Group (1~9, 01~99 or 001~100) or #9 + Line
number (e.g., 05 or 005 for line 5).

Your DND or Call Forwarding (Device) Programmable Function key flashes.
To cancel Call Forwarding Off-Premise Split:
1. At the multiline terminal, press Speaker.
- OR -
2. At a single line telephone, lift the handset.
3. Dial the Call Forward Access Code (default not assigned).
4. Dial 0 (Cancel).

If Internal and External are set both are canceled.

Your DND or Call Forwarding (Device) Programmable Function key flashes.
Off-Premise Call Forwarding for Door Boxes

These operations are performed at the Door Box Ringing Extension only.
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UNIVERGE SV8100
Call Forwarding, Off-Premise