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  1. #1
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    Phone call limiter

    Anyone help ?
    I need project with 16F84 for telephone call limiter and source code if is possible.

    •   Alt18th January 2004, 22:47

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  2. #2
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    Re: Phone call limiter

    The phone call will be limited in what way? How many minutes, how to be restarted.



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    Re: Phone call limiter

    Limit outgoing calls, all calls start with 0,9,or some other number : next, limit some call area 063,064 or some other : next, limit all calls except one
    and some other functions and limiter is with PIC16F84 and MT8870.



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    Excuse me, I do not fully understand your question. limit here means phone-number limit?? That, you can only dial some of allowed phone number?



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    Re: Phone call limiter

    Quote Originally Posted by Ivanko
    Limit outgoing calls, all calls start with 0,9,or some other number : next, limit some call area 063,064 or some other : next, limit all calls except one
    and some other functions and limiter is with PIC16F84 and MT8870.
    When you are dialing a number, you are already making an outgoing call, now maybe you are telling me is limit, international call, domestic long distances?



    •   Alt19th January 2004, 14:13

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    Re: Phone call limiter

    Yes the blocker must have next function:
    -Block all calls starts with nr.0, or nr.1, or.........nr.9
    -Block all calls starts with call area ( 0 X X ) ( X are numbers from 0-9)
    -Block all calls except one
    -Block all calls
    -Must use power from tel. line

    Maybe now is beter.



  7. #7
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    Re: Phone call limiter

    All you need is the IC that I am looking for my friend. MT8888 or MT8870, but I think it can't be powered by the phone line alone, just like your caller ID phone, you need batteries for it. Just interface it to a microcontroller then have it recognize the first number you dialed.



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    Re: Phone call limiter

    hi,

    you need to study about DTMF and you need to isolate the phone from the phone line. taking over the phone function, monitor the phone keypress by decoding the DTMF. if the key is correct, release the phone line and pass it to the phone.


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  9. #9
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    Re: Phone call limiter

    some time ago it was published by elektor a circuit that do that, but i use a atmel ic (i think)


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    Re: Phone call limiter

    Quote Originally Posted by wisely77
    hi,

    you need to study about DTMF and you need to isolate the phone from the phone line. taking over the phone function, monitor the phone keypress by decoding the DTMF. if the key is correct, release the phone line and pass it to the phone.
    That will be the function of the MT8880 or MT8870, to decode the keypress then let the microcontroller recognize it.



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    Re: Phone call limiter

    You should buy a small PABX. It's very cheap., About 100$ no shipping
    I think that it's very cheaper your project



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