NEC DS1000 - Manual (Page 167)

To place a Reverse Voice Over call:
1. While on a handset call, press and hold your Reverse
Voice Over key.
You hear two beeps, then conversation with your
co-worker in your handset.
Your Voice Over key lights red.
To return to your initial caller:
1. Release your Reverse Voice Over key.
Conversation with your initial caller (in your
handset) continues.
Your Voice Over key goes out.
To place a call to the co-worker assigned to your Reverse
Voice Over key:
1. While your telephone is idle, press your Reverse Voice
Over key.
You hear two beeps, then conversation with your
co-worker.
Your Reverse Voice Over key goes on (green).
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Reverse Voice Over
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