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In half-duplex mode, only one person may talk at a time. The radio PTT button needs
to be pressed in order to communicate to the individual called and released for the
individual called to be heard.
9.23.2.2 Direct Dialing of Phone Calls (P5370 Model Only)
1. If the phone number is not stored in the pre-stored list of phone numbers, but the phone number is
known, it can be entered directly from the keypad. Start by pressing the key, then enter the
required number from the keypad. Press and release the PTT button.
The last number directly entered can be recalled by first pressing then pressing the
PTT button.
2. A telephone ring can be heard from the speaker. When someone answers the phone, press and hold
the PTT button and speak into the microphone. Release the PTT button to listen to the individual
called. Unsuccessful interconnect signaling returns the radio to the normal receive mode and the
number remains displayed until the special call is cleared or the time-out expires or another group or
system is selected.
3. To terminate the call, momentarily press the button.
9.23.3 Dual-Tone Multi-Frequency: Overdial/Conventional Mode 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 Dual-Tone Multi-Frequency (DTMF) access digits.
Overdial operation can also be used to initiate a telephone interconnect call via DTMF signaling if a dial
tone has already been accessed on the system. This method makes 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. These numbers are accessed by pressing the key, then following the selection
mode rules. Perform the following procedures to access and dial these stored numbers.
P5350 Model Radio
1. Follow the procedure in Section 9.23.2 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
system.
2. Enter selection mode first to enable entry of Overdial numbers by pressing the button.
3. Follow the selection mode rules to call up a stored number from the phone list: Use the or
buttons to scroll through the list of stored numbers. is displayed. Press the PTT to send the overdial
sequence once. If the number needs to be transmitted again it must be selected or entered again (this
prevents unwanted numbers from being sent the next time the PTT button is pressed during the call).
Overdial select/entry mode remains active until the call is dropped, cleared, or is pressed. The
overdial select/entry mode can be re-entered if the call is still active by pressing .