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RTU-292 Operations Manual
7.5 DTMF ACCESS OPTION
This option allows a radio user to use his DTMF keypad to quickly place a telephone call via
the RTU-292. If the user does not have DTMF capability, the Squelch Break Access Option
allows the use a series of squelch breaks to automatically connect to the telephone at speed dial
location #01 (see next section). In the following description, system voice prompts are listed.
If the Voice Prompt Option is not installed, only the tone prompts will be heard.
NOTE
It is possible to enable this option remotely. If you have purchased an RTU-292
without this option and want to add it, contact JPS.
7.5.1 Initiate Call Via Attention Signal
The radio user sends the “Attention” signal to the RTU-292. The attention signal consists of
the DTMF characters “* * *” (three stars).
7.5.2 RTU-292 Response to Attention Signal
The RTU-292 will respond with the voice prompt “RTU-292 automatic phone patch. Enter
phone number followed by the “pound” sign or stand by for auto-call”. The RTU-292 will
also give the Acknowledge (ACK) tones. If Password Protection is enabled, the RTU-292 will
request the correct password prior to asking for the telephone number.
7.5.3 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-292 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-292, the unit will place a call to the telephone at the speed dial location #01. This is
an “auto-call”.
7.5.4 RTU-292 Plays Back Phone Number & Prompts for Confirmation
The RTU-292 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-
292 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-292 does not receive
confirmation within five seconds, it will give a Timeout prompt and go back to its waiting state.
7.5.5 RTU-292 Places the Call
The RTU-292 then informs the radio user that the call is being placed. The ringback
information that is provided when placing a call via the RTU-292 front panel keypad or Local
Phone is not sent over the air due to FCC regulations. The RTU-292 adapts to the phone line
while placing the call.
JPS Communications, Inc.
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