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About trunking call setup
For a trunking call between two radios, the calling radio sends a
message on the control channel, giving the identity of the called
radio and the type of call.
The network then sets up the call by:
■ contacting the other radio, and
■ directing both radios to switch to a traffic channel
The conversation is carried out on the traffic channel.
When the conversation is finished or when your allowed call time
expires, the network ends the call, and the traffic channel is then
available for other calls. The network may also end the call if
neither caller transmits for some time or moves out of range.
Transmit timer
Your radio may have a transmit timer that limits the amount of
time you can transmit continuously. When the transmit timer is
about to expire, the LED flashes red and the radio gives three
beeps.
If the transmit timer times out, the call clears down.
Call time limit
The length of your call may also be limited by the network settings
or by your radio. Your radio displays the call duration while it is in
progress, either as time remaining for the call or time already used
for the call.
When your call time is about to expire, the LED flashes red and the
radio gives a repeated beep.
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