37
Getting Started
environment, you may want to move the MTP850 closer to 
you for better transmission.
3. To de-activate speakerphone, press Erpce. The display 
shows Speaker OFF.
To burst into conversation while the other party is talking, 
press and hold PTT. You will hear a tone. Start talking, and 
release PTT to listen again to the other party.
Muting/Unmuting the Bottom Microphone 
During a Phone, PABX, or full-duplex Private Call, use the 
mute feature to:
• hold conversation without being heard by the caller
• silence possible background noise in your area
1. Press Mute. The display shows Mute is ON. The 
microphone is muted. You can hear the incoming audio, but 
the caller cannot hear any speech coming from your 
MTP850.
2. To speak, press Unmut. The display shows Mute is OFF. 
The microphone is on.
Covert Mode
If configured by your Service Provider the Covert Mode gives 
to you the ability to completely shut down all visible and 
audible MTP850 alerts and notifications. This feature makes 
the MTP850 effectively unnoticeable even in a silent and 
dark environment.
To Enter the Covert Mode:
• Press the Cover Mode one-touch button (if programmed 
by your Service Provider).
• Select Covert Mode in the Security menu (refer to “Covert 
Mode” on page 119).
High/low Audio in Covert Mode
• If none of the accessories are connected to the radio then 
high/low audio toggle is not enabled.
• External earpiece/PHF connected - by pressing high/low