NEC 920 - Manual (Page 26)

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1) Press FCN + 4.
2) Press 4 to change.
MUTE
The Mute function operates only when the phone is in the
conversation mode. There are two (2) Mute positions, MUTE
or FULL MUTE.
MUTE - This function switches off the microphone while in
the conversation mode.
FULL MUTE - In the portable configuration, this function
switches off both the microphone and the earpiece while in
the conversation mode. While mounted in a vehicle (HF
Adapter), this function turns off the phones external
microphone and speaker.
MUTE:
1) Press FCN + 3. This switches off the microphone.
2) Press FCN + 3. This switches the microphone back on.
PWR MUTE
o o o o
IN USE
PWR
o o o o
IN USE
PWR
t o n E
L o n 9
PWR
t o n E
S t A n d A r D