NEC UNIVERGE SV8100 Features & Specifications Manual page 844

Issue 5.0
When the telephone is idle:
To place a call to your Reverse Voice Over destination:
1. Press your Reverse Voice Over key (Program 15-07 or SC 851: 47 + destination extension).
You can optionally lift the handset after this step for privacy.
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UNIVERGE SV8100
Reverse Voice Over