Motorola TETRA MTM800 Manual page 186

Making an Emergency Group Call
To initiate or answer a call:
1. Enter emergency mode by pressing and holding
the
2. Press and hold PTT.
3. Wait for the talk permit tone (if configured) and talk.
4. Release PTT to listen.
Receiving an Emergency Group Call
The display shows the caller's identity as a private number or
an alias. If the display is idle, it will show
62
key.
Emrgncy-In Use
.