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RTU-292C Operations Manual
6-4
6.3.1
Initiate Call Via Attention Signal
The radio user sends the “Attention” signal to the RTU-292C. The attention signal consists of
the DTMF characters “
* * *
” (three stars).
6.3.2
RTU-292C Response to Attention Signal
The RTU-292C will respond with the voice prompt “
RTU-292C automatic phone patch. Enter
phone number followed by the “pound” sign or stand by for auto-call
”. The RTU-292C will
also give the Acknowledge (ACK) tones. If Password Protection is enabled, the RTU-292C will
request the correct password prior to asking for the telephone number.
6.3.3
Radio Caller Provides Calling Directions
The radio user can then enter a phone number (terminated by the # sign), or “* n n #” for speed
dial location “nn”. If the caller forgets to enter “#” the RTU-292C will simply wait 4 seconds to
ensure that data entry is complete and then begin to place the call. If no DTMF is detected at the
RTU-292C, the unit will place a call to the telephone at the speed dial location #01. This is an
“auto-call”.
6.3.4
RTU-292C Plays Back Phone Number & Prompts for Confirmation
The RTU-292C will play back the number it intends to dial. In the case of speed dial numbers,
it only plays back the speed dial location and not the number stored at that location. The RTU-
292C then prompts the caller for confirmation with the prompt “
Please confirm by entering a
single “Star” digit
”, along with the Query tone prompt. If the RTU-292C does not receive
confirmation within five seconds, it will give a Timeout prompt and go back to its waiting state.
6.3.5
RTU-292C Places the Call
The RTU-292C then informs the radio user that the call is being placed. The ringback
information that is provided when placing a call via the RTU-292C front panel keypad is not sent
over the air due to FCC regulations. The RTU-292C adapts to the phone line while placing the
call.
If the number is busy, the busy tones will be broadcast for approximately 5 seconds before the
RTU-292C terminates the call attempt.
Once the RTU-292C detects ringback, the RTU-292C begins a 30 second timer and waits for the
call to be answered. If this does not happen before the timer expires, the call attempt is
terminated.
6.3.6
After the Call Begins
The RTU-292C now enters its "Command Mode", meaning that the phone user may enter any of
the available DTMF commands from Table 3-1. The Inactivity Timer will now begin to run. If
this time expires (due to a lack of speech or other audio activity), the RTU-292C will give a series
of 3 short beeps as a warning. The radio caller or the phone user may initiate activity within 5
seconds of the warning beeps to reset the timer. If neither user does so, the unit will then
terminate the call.
To terminate the call at any time, the radio user may enter
* #
at any time. The phone user may
also enter
* #
to hang up.
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