GENNUM 5000 - Manual (Page 17)

17 Features
TM
Muting and Un-Muting the Microphone While on an Active Call
To Mute the Call
Briefly press and release the PINCH button. A single beep followed by
periodic beeps is heard, indicating the headset is muted.
To Un-mute the Call
Briefly press and release the PINCH button. The periodic beeps heard from
your headset stops, indicating that the call has been un-muted.
Ending a Call
To End a Call
Briefly press and release the SIDE button
or
Press and release the PINCH button after 3 beeps.