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You can also participate in an Emergency Group Call
(initiated by others) in Emergency Mode or in a standard
Group Call.
Hot Microphone Feature in TMO
If the Hot Microphone feature was programmed into your
MTP850 by your Service Provider, you can make an
Emergency Group Call without the need to press and hold
the PTT.
The following will happen upon entering Emergency Mode:
1. The MTP850 will automatically send an Emergency Alarm
to the dispatcher (if configured by your Service Provider).
2. A Talk permit tone will be heard.
3. The following typical display will appear:
The microphone will stay open for a time
period determined and programmed by
your Service Provider.
After the Hot Microphone time period expires,
or if you press PTT during the Hot
Microphone period, or if you press End soft key: the Emgcy
Mic Ended message will be displayed.The talk session ends.
To resume, press the Emergency button again.
If talk permit is granted to another member of
the group, an “Emergency call received” tone
will be heard. If configured by your Service
Provider, your MTP850 will automatically
attempt to get talk permit again and the Wait
For Mic message will be displayed.
Receiving an Emergency Group Call
A terminal in TMO receives an Emergency Group Call to the
selected group, associated ATG (Announcement), or
During this pending time the MTP850 microphone is not active
until the Emgcy Mic On message is displayed again.
Hot Microphone feature is available in DMO and TMO modes.
Hot Mic On
Folder 1
Talkgroup 1
Optns End
Emgcy In Use
ID:David
Wait For Mic
Optns End
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