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12.9 TELEPHONE INTERCONNECT CALLS
12.9.1 Receiving a Telephone Interconnect Call (Trunked Mode
Only)
Receiving a telephone interconnect call is identical to receiving an individual call. See the DTMF
Overdial Operation section if access to services requiring "over-dial" is needed. Overdial
operations are available for any special call whether it is an individual call or a telephone
interconnect call.
12.9.2 Sending a Telephone Interconnect Call (Trunked Mode
Only)
Use the following procedures to initiate and complete a Telephone Interconnect call:
1. To select a previously stored phone number, select phone call mode from the menu, press
p and use the RAMP controls, , or ., to scroll through the list of stored phone
numbers. The selection mode rules apply. While in the phone call list, the m key will
toggle the display between the phone call name and the phone call number. If the phone
number is not stored in this list but the phone number is known, it can be entered directly
from the keypad. If necessary, a pause can be entered by pressing and holding 0-9, *, or #
until an underscore appears in the display.
2. Press and release the PTT button; the radio performs the necessary signaling to obtain a
communication channel. When the signaling is complete and the radio is clear to transmit, TX
indicator turns on and the channel access tone sounds. Line 1 shows the accompanying name
if selected from the list of stored numbers or the phone number if entered directly. The
message *PHONE* is displayed on line 2. The radio then automatically transmits the
programmed number stored in the special call queue.
3. Telephone ringing will be heard. When someone answers the phone, press the PTT button
and speak into the microphone. Release the PTT button to listen to the caller. Unsuccessful
interconnect signaling returns the radio to the normal receive mode and the number remains
displayed until the special call is cleared by pressing the c button or the time-out expires
or another group or system is selected.
4. To terminate the call, momentarily press the c button.
The M7100
IP
Series mobile radio is capable of half-duplex conversation only. The
caller’s message can only be sent if the PTT button is pressed (the radio is
transmitting) and the caller can only be heard by the person being called when the
PTT is released (the radio is receiving).
12.9.3 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 signaling 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