User's Guide

emergency Group Calls only. No other call types are
supported in Fallback Mode.
6.3.2.1
Indications of Auto Fallback Mode
When your radio is using a Fallback channel, you hear the
intermittent Fallback Tone approximately once every 15
seconds (except while transmitting). Your radio only
permits PTT on the selected Group Contact (Group Call,
Multigroup Call, or Site All Call). It does not allow you to
make other types of calls.
6.3.2.2
Making/Receiving Calls in Fallback
Mode
NOTICE:
Calls are heard only by radios that are monitoring
the same Fallback channel and selected to the
same Group. Calls are not networked to other sites
or other repeaters.
Emergency voice calls or Emergency Alerts are not
available in Fallback mode. If you press the
emergency button in Fallback mode, the radio
provides an invalid key press tone.
Private (radio to radio) and Phone calls are not
available in Fallback mode. If you attempt a call to a
private contact, you will receive a denial tone. At this
point you should select a desired group contact.
Other non-supported calls include Remote Monitor,
Call Alert, Radio Check, Radio Enable, Radio
Disable, Text messaging, Location Updates, and
packet data calls.
Enhanced Traffic Channel Access (ETCA) is not
supported in Auto Fallback mode. If two or more
radio users press PTT at the same time (or at
almost the same time), it is possible that both radios
transmit until PTT is released. In this event, it is
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