Emergency Operation (TMO) 2-19
March 2009 Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual 6866588D21-D
5.1.4 Hot Mic
If the terminal is provisioned with the Hot Mic feature, upon entry into emergency mode, the terminal
will set up an Emergency Group Call, and when granted transmission permission will open the
microphone automatically, allowing the user to transmit voice without pressing or holding any PTT
button. Transmission will continue for a provisioned amount of time. Subsequent presses on the
emergency button within emergency mode will initiate Hot Mic transmission again.
Pressing of PTT during hot mic transmission will stop hot mic operation, and normal PTT operation
will take over (that is when PTT is released transmission will stop).
5.2 Emergency Private Call
Emergency Call can be provisioned to be a Half-Duplex or Full-Duplex private call. If Emergency
Call is provisioned as private call, when the user presses the emergency button/key, the terminal will
initiate a private call with emergency call priority to the provisioned address. No emergency alarm is
sent and there is no emergency mode; the emergency state (all user indication and rejection of other
services) ends as soon as the call ends.
5.3 Air Interface Aspects
5.3.1 Emergency Identity and Call Type Modification
The terminal supports initiation of an Emergency call to a designated TETRA ID. If the SwMI
modifies the call type to another call type, the terminal will follow the new call.
If emergency call is provisioned as a private call, and the SwMI modifies it to a group call the
terminal will accept this modification and convert the call to a group call in emergency mode. In this
case, the terminal will automatically leave Emergency Mode as soon as the group call ends.
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