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'Looking for information'
1998\11\04@211714 by D. F. Welch

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Hello all,
  I am working on a PIC based telephone project which will
intercept and screen all incoming calls, without the phone ringing and
conditionally, based the screening criteria,
either issue a voice message or ring the phone and connect the phone to the
incoming line.

Can anyone point me to information on how to carry out the
actual connect functions to the handset.  This is the only
part of the project I haven't figured out.

Thanks in advance.


73,
Dan Welch
spam_OUTw6dfwTakeThisOuTspamqsl.net

1998\11\04@223440 by John Hansen

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At 06:15 AM 11/4/98 -0800, you wrote:
>Hello all,
>ÊÊ I am working on a PIC based telephone project which will
>intercept and screen all incoming calls, without the phone ringing and
>conditionally, based the screening criteria,
>either issue a voice message or ring the phone and connect the phone to the
>incoming line.
>
>Can anyone point me to information on how to carry out the
>actual connect functions to the handset.Ê This is the only
>part of the project I haven't figured out.
>
>Thanks in advance.
>
>
>73,
>Dan Welch
>.....w6dfwKILLspamspam@spam@qsl.net
>

I've been looking into this as well.  My theory is that most of the automated
calling services these days have about one second of silence after you pick up
the phone, but before you are connected to the salesperson.  I think it should
be possible to key off this delay to hang up on automated sales calls.  The
problem is getting the pic chip to answer the phone and to hang up at the
appropriate time (or to actually ring you if it is not a sales call).  In
asking around about this, everybody I heard from said the best book on the
subject was one that used to be sold by (believe it or not) Radio Shack.   I
remember that book and now regret not having bought one, but it is no
longer in
print.  If you can find someone with a copy, I'd like to have one too!

Best of luck with your project.

John, W2FS

1998\11\05@051859 by Mark Willis

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John Hansen wrote:
{Quote hidden}

 That book was great!  It was written by some folks at Bell Labs, and
covered things pretty well - My copy has disappeared (apparently
forever), I'll HELP someone re-publish the darn thing (or buy multiple
copies!) if it can be re-published - If I'm lucky, my copy may
eventually re-surface, but don't hold your breath.  Good book.

 Mark, .....mwillisKILLspamspam.....nwlink.com

1998\11\05@192423 by Eric Smith

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John Hansen <EraseMEhansenspam_OUTspamTakeThisOuTAIT.FREDONIA.EDU> wrote:
> In asking around about this, everybody I heard from said the best book
> on the subject was one that used to be sold by (believe it or not)
> Radio Shack.

Surely you aren't referring to _Understanding Telephone Electronics_?
I was underwhelmed.

1998\11\05@211809 by John Hansen

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At 12:23 AM 11/6/98 +0000, you wrote:
>John Hansen <hansenspamspam_OUTAIT.FREDONIA.EDU> wrote:
>> In asking around about this, everybody I heard from said the best book
>> on the subject was one that used to be sold by (believe it or not)
>> Radio Shack.
>
>Surely you aren't referring to _Understanding Telephone Electronics_?
>I was underwhelmed.
>

Honestly, I don't know the name of the book.  I've just had too many people
recommend it to me.

John Hansen

1998\11\19@145116 by John Hansen

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At 12:23 AM 11/6/98 +0000, you wrote:
>John Hansen <@spam@hansenKILLspamspamAIT.FREDONIA.EDU> wrote:
>> In asking around about this, everybody I heard from said the best book
>> on the subject was one that used to be sold by (believe it or not)
>> Radio Shack.
>
>Surely you aren't referring to _Understanding Telephone Electronics_?
>I was underwhelmed.
>

Honestly, I don't know the name of the book.  I've just had too many people
recommend it to me.

John Hansen

1998\11\20@065955 by Eric Smith

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face
John Hansen <KILLspamhansenKILLspamspamAIT.FREDONIA.EDU> wrote:
> In asking around about this, everybody I heard from said the best book
> on the subject was one that used to be sold by (believe it or not)
> Radio Shack.

Surely you aren't referring to _Understanding Telephone Electronics_?
I was underwhelmed.

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