NEC Univerge SV9100 - To Respond to a Voice over Alert Tone to Your Extension; To Return to Your Original Call

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 To use Service Code 690 for Voice Over, Program 11-16-08 (Voice Over Service Code) must be
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To respond to a Voice Over alert tone to your extension:
You can respond only if you have a Voice Over key.
1. Press the Voice Over key.
 The Voice Over key lights steady (green), and you can talk to the interrupting party.
 You cannot respond by dialing the Voice Over Service Code (6).
To return to your original call:
1. Press the Voice Over key.
2. Press the Voice Over key again.
 Your Voice Over key flashes red when you are talking to your original call.
 To switch between your original call and the interrupting party, just keep pressing the Voice Over key.