(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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