From: Roger Johansson
Subject: Re: Telephone Ring Suppressor
Date: Sun, 22 Sep 2002 13:09:02 +0200
References: <email@example.com> <3D8D4E05.533D18D4@pcb-designer.com> <firstname.lastname@example.org> <3D8DEEEA.386F836E@dont.do.it.here.com>
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>I think you may have something here.
>You can leave the call through number on your out going message.
>If that number is not keyed in before the end of the out going message,
>the line is hung up.
>Its like the "to bypass this message press 1" message.
But that would open the line for all kinds of non-automated spam,
market researchers, political surveys, etc..
I would prefer to have a telephone that never rings, unless it is one
of my close friends.
Others can write a snail mail if they want to reach me.
Or email, etc..
>If the tele-scum is not really listening to the out going messages anyway,
>they will never hear this by-pass number.
A lot of phone-spam is not automated. Instead they hire people to make
the calls, often young and poor people who cannot get a better job.
Telemarketing is already big and it gets worse for every year.
>> I think the best solution is to design a circuit which requires the
>> caller to add one or two extra numbers to let the call through at all.
>> If your real number is 243512 you just tell all your friends that
>> you've got a new number, 243512-34, and you will only get calls from
>> the people who know this in the future.
>> Others will never reach you.
>> A microcontroller could take the call, listen for the extra numbers
>> tone codes, and hang up or alert the owner with some nice sound or
>> light signal.
I know there are such devices which lets you add one or more numbers
to your phone number, but I cannot find a circuit for it.
But it shouldn't be too hard to design such a circuit.
Maybe some of the electronics gurus here could tell us how to do it?