Motorola TETRA MTM800 Manual page 184

Making an Emergency Group Call
To initiate or answer a call while in Emergency mode:
1. Press and hold PTT
2. Wait for the talk permit tone (if configured) and talk.
3. Release PTT to listen.
Your MTM800 enters TMO by pressing the Emergency button
(if configured by your Service Provider). The terminal attaches
to the predefined talkgroup and starts the Emergency Group
Call. If the predefined talkgroup is invalid the terminal attaches
to the last selected talkgroup.
Hot Microphone Feature
If the Hot Microphone feature was programmed into your
MTM800 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 MTM800 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, the
message will be displayed, and the terminal
reverts back to Emergency Mode. The Hot Microphone
feature is now disabled and PTT operation reverts back to
normal.
To resume, press
If talk permit is granted to another member of
the group, an "Emergency call received" tone
will be heard.
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