NEC UNIVERGE SV8100 Features & Specifications Manual page 1006

Issue 5.0
Operation
To send Off-Hook signals to an extension busy on a call:
.
Your extension may send Off-Hook signals automatically.
1. Dial 809 (Program 11-12-02).
- OR -
Press the Off-Hook Signaling key (Program 15-07-01 code 33).
You hear Ring Busy Tone.
.
The called extension hears Call Alert Notification.
.
To answer Tone Override:
1. Receive Tone Override.
2. Press Hold and talk with the party.
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UNIVERGE SV8100
Tone Override