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The ORION radio is capable of simplex (one-way) conversation only.
The caller can only hear the radio if the PTT button is pressed (the radio
is transmitting) and the caller can only be heard when PTT is released
(the radio is receiving).
DTMF Overdial/Conventional Mode Telephone Interconnect
Once the radio has established a connection to the public telephone system,
it may be necessary to "over-dial" more digits to access banking services,
answering machines, credit card calls or other types of systems that require
DTMF (Dual-Tone Multi-Frequency) access digits. Overdial operation can
also be used to initiate a telephone interconnect call via DTMF signalling if
a dial tone has already been accessed on the system. This is the method that
is used for making a telephone interconnect call while operating in the
conventional mode but will also function in trunked mode if a dial tone is
directly accessible. Telephone numbers and other number sequences for
overdialing can be stored in the phone list when programming the radio or
stored by the operator in the first ten phone list entries. These numbers are
accessed by pressing p then following the selection mode rules.
The following steps are required to dial these numbers:
1. Follow the procedure in Sending A Telephone Interconnect Call
(Trunked Mode Only) to establish a connection to the telephone
system or consult the system administrator for the procedure to access a
dial tone on the trunked or conventional s ys tem.
2. Overdial numbers are transmitted using either method as follows:
METHOD 1: Press and hold PTT while entering the overdial number
sequence from the keypad. This method sends DTMF tones
during individual, telephone interconnect, trunked group or
conventional channel calls. Anytime the PTT button is
pressed and held, the keypad is enabled for DTMF entry.
NOTE