DTMF Calls 29
DTMF Calls
DTMF (dual tone multiple frequency) is the tone-
based system used in the world’s telephone net-
works. If your system has access to the PSTN (pub-
lic switched telephone network) or other networks
that make use of DTMF tones, your radio can make
a call to a telephone or send control codes to a
remote device.
There are two ways to make DTMF calls on your
T2020:
■ preset DTMF calls, and
■ dialed DTMF calls.
Preset DTMF
Calls
There are two different types of preset DTMF calls
that may be programmed for your radio.
■ A single one touch DTMF call may be assigned
to the auxiliary key (
)
. To make the call,
press the auxiliary key.
■ A DTMF call may be associated with up to 20
programmed alpha symbols. See “Alphanu-
meric Entry Mode” on page 32 for further
details.
The transmit indicator ( ) appears briefly and the
radio may give a short beep, as the call is transmit-
ted.
Dialed DTMF
Calls
Consult your system manager or the person who
programmed your radio for what DTMF strings
you can dial. They consist of DTMF tones 0 to 9, *
and #, and may include tones A to D.
Dialing Tones A to D
If you wish to dial tones A to D, your radio may be
programmed so that you can use the PTT key as a
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