Press and release PTT. Ringing sounds. Called party answers. Wait for the called party to finish speaking. Press and hold PTT. Wait for the talk permit tone (if configured) and talk. Release PTT to listen. Press 
to terminate call.
Making DMO Half-duplex Private Call
Enter DMO. From the Home display dial a number. Press and hold PTT. Wait for the talk permit tone (if configured) and talk. Release PTT to listen. Press 
to terminate call.
Making Full-duplex Private Call/ Phone/PABX Call
From the Home display dial a number. Press CType to select the call type. Press and release 
. Ringing sounds. Called party answers. Press 
to terminate call.
Answering Call
Your MTP850 Ex/MTP810 Ex switches to the incoming call and alerts you of the incoming call. To answer the call, press 
for
Sending Status Message
Select the desired group, then press MENU and select Messages > Send
Status. Select status and press 
or PTT.
Tips & Tricks
• Home Key
Not sure where you are? Want to get back to Home display? Press 
.
• Backlight Control
You can either disable backlight (covered operation) or have it automatically turned on, by any key press.
You can also press the upper Side key - just to turn On/Off the backlight (if configured).
• High/Low Audio Control
You can control audio routing (speaker / earpiece) for any
However, you can define via the menu to have all Group calls in high audio
( MENU > Setup > Group Audio).
• Unified Contact List
You can keep several numbers (Private, Mobile, Home, Work, PABX, Other) for the same person under the same contact name.
• Text Size
You can see the text on the display in three sizes: Standard, Zoomed, or Extra Zoomed ( MENU > Setup > Display > Text Size).
• “My Groups” Folder
You can select any group (TMO or DMO) and add it to your personal folder.
In the Home display, press 
to quickly access your “My Groups” folder.
• Man Down
You can enable the Man Down feature in case of entering any risky operation.
Select MENU > Man Down > On.
To disable the feature, press MENU and select Man Down > Off.