NEC DSX Feature Handbook page 135

Setting Up Handsfree Reply (Super Display)
Turn Handsfree Reply on.
On
If on, you can reply to incoming voice announcements by just speaking toward your
phone.
Turn Handsfree Reply off.
Off
If off, you can reply to incoming voice announcements only by lifting the handset.
Press to turn on Handsfree Reply for this call only.
MUTE
Back up to the previous level.
Back
Exit to the idle menu display.
Exit
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Features
| 135