User's Guide

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. Display-
equipped radios also show the message, “Feature
not available”.
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
possible that none of the transmissions will be
understood by receiving radios.
Making calls in Fallback mode is similar to normal
functioning. Simply select the group contact you wish to
use (using the radio’s normal channel selection method),
and then press the PTT to start your call. It is possible that
the channel may be in use already by another group. If the
channel is in use, you receive a busy tone and the display
will say “Channel Busy”. You may select Group, Multi-group
or Site All Call contacts using your radio’s normal channel
selection method. While the radio is operating on the
Fallback Channel, the Multigroup operates just like other
Groups. It is only heard by radios that are currently
selected to the same Multi-group.
Returning to Normal Operation
If the site returns to normal trunking operation while you are
in range of your Fallback repeater, your radio automatically
exits Auto Fallback mode. You hear a registration "beep"
when the radio successfully registers. If you are in the
range of an operable site (that is not in Fallback mode), you
may press the Roam Request button (if programmed for
your radio) to force your radio to search for and register on
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