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From: firstname.lastname@example.org (Nico Coesel)
Subject: Re: Telephone Ring Suppressor
Date: Mon, 23 Sep 2002 07:04:17 GMT
References: <email@example.com> <3D8D4E05.533D18D4@pcb-designer.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Mon, 23 Sep 2002 06:54:27 +0000 (UTC)
X-Newsreader: Forte Free Agent 1.21/32.243
Roger Johansson wrote:
>>We still need a cheap answering machine which REQUIRES you
>>to enter a number sequence before you can leave a message
>>(no "default" mailbox).
>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
That won't work (at least over here). The Public telecom system will
ignore the extra numbers. So, you'll have to make a device that
answers the telephone, tells the caller to enter the password and wait
for the digits.
This is a real pain with ISDN or digital PABX systems. In many cases
these telephones need to be put in DTMF mode by holding a certain key.
Not every user knows that.
Where I'm aiming at is that whenever someone needs you for an
emergency (say your kid has had an accident in school) that person may
not reach you because of a device blocking incoming calls.
If you really want to get rid of telemarketeers: don't list your phone
number and only give it to people who need to know your number.
Reply to nico@nctdevpuntnl (punt=.)
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