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Operation
34
025-9368H
Mobile-to-Telephone
The mobile first gains access to the Model 748 (see “Call Setup (Mobile)” earlier in this section).
The Model 748 takes the phone line off-hook and opens the audio path from phone to transmitter.
The mobile now hears dialtone (from the local CO) and can start dialing a telephone number. The
mobile has twice the programmed
DTMF interdigit time
to dial the first digit. After the first digit, the
specified
DTMF interdigit time
is used as the maximum time between digits. The digits taken in
from the mobile are regenerated as specified by
Dialout mode
into the phone line by the Model 748.
The telephone number is monitored (while it is dialed) by the toll restrict routines. If the number
dialed is toll restricted, the call attempt is terminated and error tones are sent to the mobile. Once
into the conversation mode (finished dialing the phone number), the Model 748 is no longer
regenerating DTMF. The audio from receiver to telephone is enabled, the conversation timer has
been initialized with
Call limit time
for that user (radio). If enabled, the mobile activity timer has
been initialized. Each time the mobile keys up, the
Mobile activity time
is used to reset this timer. If
at any time the mobile activity timer expires, the call is disconnected. Single warning beeps are sent
every three seconds starting 12 seconds before the mobile activity timer expires. The conversation
timer may not be reset since this controls the length of the call. Double warning beeps are sent every
three seconds starting 15 seconds before the call is disconnected. To terminate the call, the called
(phone) party enters “#0” or a long “#”, or the mobile must enter its
Disconnect ANI
.
Mobile-to-Mobile
The mobile first gains access to the Model 748 (see “Call Setup (Mobile)” earlier in this section).
The Model 748 will prompt the caller to overdial a number. This will be either a prompt tone (Dial
tone or 925 Hz beep) or a voice prompt (prompt #2). The caller then overdials the number (user
number or
Access ANI
) of the user (radio) they wish to contact. The call then progresses exactly as
though the originating mobile is a telephone caller, including any voice prompts (see Telephone-to-
Mobile call). Note that ringouts on the channel for Mobile-to-Mobile calls differ in cadence from
Telephone-to-Mobile calls. A Telephone-to-Mobile call sends ringing in two-seconds-on / four-
seconds-off bursts. A Mobile-to-Mobile call sends ringing in two-seconds-on / two-seconds-off
bursts. This way the mobile being called can tell by the ring cadence if the caller is another mobile or
is land based. If both the originating mobile and destination or called mobile use sub-audible
signaling, the originating mobile's tone/code is encoded during dialtone and overdial. Once the
Model 748 starts ringouts, the destination or called mobile's tone/code is encoded for the duration of
the ringing. Once the destination mobile answers, the Model 748 will perform tone/code translation
between the originating and destination mobiles.
ANI Mobile-Repeat
The mobile first gains access to the Model 748 (see “Call Setup (Mobile)” earlier in this section).
The Model 748 will transmit a short beep indicating that the mobile has obtained access to the
repeater. The
Mobile activity
timer and
Call limit time
take effect here and the call progresses until
the mobile sends a disconnect sequence or one of the timers expire.
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