http://www.circuitcellar.com/flash2002/grand.htm
pic to boot!

John Nall wrote:
> (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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