Amplicom PowerTel 720 Cordless Phone w/Answering Machine - Manual (Page 27)

Use a headset (not included) with the cordless phone
Plug your headset into the headset socket marked
on the right side of the
handset.
Mute the phone
Muting the phone during a call will silence the mouthpiece on the phone so it
does not transmit any noise to parties on the other end of the line.
Cordless Phone:
To switch off the mouthpiece, press A or MUTE. Mute On will be displayed.
To switch it on again, press A or MUTE . The display will show Off.
Switch the cordless handset ringer on and off
To switch the ringer on and off, press and hold for five seconds.
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