Try "phone call filter" there are a lot of software solutions if you can use
them...

Mauricio Jancic
Janso Desarrollos
Microchip Consultant Program Member
info@janso.com.ar
www.janso.com.ar
+54 11 4542 3519
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of John Nall
> Sent: Saturday, November 12, 2005 2:04 PM
> To: Microcontroller discussion list - Public.
> Subject: [OT] Looking for a phone silencer
> 
> (I wasn't sure what topic this should go under -- probably either PIC or
> EE could be justified.  But I'll use OT anyway).
> 
> I'm looking for a phone silencer, and given all the experience on the
> piclist in designing things and just general knowledge, I feel sure
> someone here can probably point me in the right direction.  I've tried
> using Google to search, but apparently am not phrasing the appropriate
> search terms, because I have not come up with anything even close.
> 
> By "phone silencer" I mean a box that sits between the phone and the
> jack, and decides whether or not to let the phone actually ring.   This
> device would have the ability to have a list of numbers in memory, and
> would test the incoming caller-id number against the list.  If the
> number were on the list, then the phone would ring.  If it were not on
> the list, then the phone would not ring but everything else would work
> the same (which is to say that after 5 silent rings, voice-mail would
> pick up and take a message if the caller wanted to leave one).
> 
> If anyone can point me to such a device, either commercial or just a
> circuit, I would be grateful.
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