47
DMO Group Call
General
In DMO, the MTM800E can be used without your Service 
Provider’s infrastructure.
Direct Mode allows communication with other terminals also 
operating in Direct Mode, which are on the same frequency 
and talkgroup as your MTM800E.
You can receive a call:
• From the selected talkgroup
• From other users within talkback range (if configured by 
your Service Provider). This is called an InterMNI (Mobile 
Network identity) call.
• From an open group. (An open group is a super-group to 
which all DMO groups belong.)
When you start a call, the members of the selected talkgroup 
who have their units turned on, and are within the group 
subscriber identity (as configured by the Service Provider), 
will receive the transmission.
In DMO the MTM800E can communicate with the trunking 
system (and vice-versa) if the Gateway option is enabled in 
the MTM800E.
To enhance the terminal’s DMO coverage area the DMO 
group can link to a repeater if the Repeater option is enabled 
in the terminal. Additionally the GW + Rep (gateway and 
repeater) communication mode can be used. 
If Transmit Inhibit is activated while the terminal is set to 
DMO, the PTT is disabled. You can only listen. For detailed 
information on Transmit Inhibit, see page 44. DMO Talkgroup 
selection is allowed when Transmit Inhibit is activated. 
In DMO it is only possible to place Group Calls, Emergency 
Group Calls and Private Simplex Calls.