CoComm F740 - Keyboard Functions: Part 3; Mute and Hands-free Buttons

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Keyboard
Key Function
[ ] Mute button
[ ] Hands-free
button
Press during an active call to mute your microphone.
In standby, press to make a call in hands-free mode, without
lifting the handset. During an active call, press to enable or
disable phone hands-free mode.