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Tel. number converter

Discussion in 'Misc Electronics' started by J. Yazel, Mar 12, 2006.

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  1. J. Yazel

    J. Yazel Guest

    I'm looking for a device that will input a dialled telephone number
    and convert it to another number. Both input and output must be
    standard telephone line characteristics.

    This is to change a device that has a permanent number that it
    dials and I need it to dial a different number.

    Thanks for any info.

  2. Don Taylor

    Don Taylor Guest

    Tone dial or pulse dial?
    Dedicated phone line for this device or shared with other calls?
  3. Art

    Art Guest

    Simplistic means would be "Call Forwarding", many systems allow you to
    designated your incoming calls to be automatically forwarded to the third
  4. J. Yazel

    J. Yazel Guest


    Tone dial.

  5. Ken Taylor

    Ken Taylor Guest

    If it gets too hard to find anything else, get an old PC and two modems.
    One modem receives the dial string, the next dials out.

    Or use a cheap PABX.


  6. Noah Little

    Noah Little Guest

    It's probably not his device, and was locked into a single number for a
  7. J. Yazel

    J. Yazel Guest


    I don't have the info to reprogram the ROM.

    It's a 20-year-old Mitsubishi security sytem but since it still works
    perfectly, I can't see paying a couple of thousand for a replacement.

    Do you know where I can get a copy of the installation manual
    (containing the ROM programming info)?


  8. JeffM

    JeffM Guest

    Yuck... It's starting to sound like a can of worms.
    Fields, upon checking his supply room for larger cans, found none.
  9. JeffM

    JeffM Guest

    I'm looking for a device that will input a [dialed] telephone number
    Ah. So we're talking HIGH security.
    Hasn't everybody know for >35 years
    that the 1st thing you do before burgling a building
    is cut the phone line and see if the cops show up?

    The smart ones bring along a roach clip
    and just jumper it at the block.
    Upon leaving, they retrieve the jumper.
    Sometimes folks don't know they've been burgled for days.

    "Security system" phone dialers are a joke.
  10. Ken Taylor

    Ken Taylor Guest

    I'm betting you could read that ROM, search and find the digit string,
    then replace it in an otherwise duplicate EPROM. At least, that's what
    I'd try.....


  11. J. Yazel

    J. Yazel Guest


    That's like changing a tire at 60mph.

    Humor aside, I can't take it out of service to try to decipher the
    board. I don't have a schematic or a parts list and I'm not very
    good at tinkering.

    I am just looking for an external converter.

    Thanks very much for the help.

  12. Bill

    Bill Guest

    Who owns the phone number that is dialed? And how did it get in there in the
    first place?

    You might look at this DTMF transceiver or others. I have no idea if it would
    work for you or not. Or just DTMF receivers that could trigger something like
    a speed dial. I have no idea what you want to transmit.

    Or why not just buy a whole new device? Like others I would be wary of a
    strictly landline connection if this is important.

  13. Now that you mention it, Bill, there are the liability issues
    accompanying any retrofit of this sort. Suppose a conversion device is
    put in place (seems to be do-able, now that Jack has provided a bit more
    information) and at an alarm event, it fails. Deep regret, if what's
    being protected is owned by Jack; lawsuit city if it's not.
  14. Ken Taylor

    Ken Taylor Guest

    You didn't say it was in service and has to stay that way. Okay, pick up
    a cheap PABX and when this security system grabs the line ignore its
    DTMF dialling pulses and have the PABX dial the correct number for you.
    This way you can even change it later if you need to.


  15. J. Yazel

    J. Yazel Guest

    First, let me repeat that I appreciate all of the attempts to help

    However, my original message apparently wasn;t clear on one point.

    I am only looking for a production unit that is fully tested,
    warranted and inexpensive (e.g. less than $100)..

    This system is not a hobby so I can't use experimental equipment.

    A final thanks for your good intentions.

  16. If you're talking a $100 item that can be just plugged in the phone
    line, from a supplier that will guarantee function to the satisfaction
    of your loss prevention department, such a thing doesn't exist. By the
    way, that price limit and your previous description of the importance of
    the system would seem to be in conflict.
    What is the economic exposure if it fails, and how much would a
    replacement alarm system cost? That ought to be the starting point for
    your "modify or replace" decision.
  17. Don Bowey

    Don Bowey Guest

    Google for auto-dialer. I checked out only one of the hits, and it was
    $169. But you should find others with better price.

  18. quietguy

    quietguy Guest

    I am more cynical - to me it sounded like a way to beat one of those security
    systems that dial a monitoring service when a security breach (break-in) is
    detected - the device would ensure no alarm is raised by diverting the call to
    a different number.


    Don Taylor wrote:

    I was guessing, from the wording of his posting, that he had some dedicated
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