Maybe what we need, in addition to "black list" is "black hole"; A special number we can forward our most despised callers to, and once in the black hole, all they get is infinite ring.
Premier Service (I was not expecting to do this, but I love the Premier features)
Panasonic KX-TG4024 (w/ 4 handsets)
Customer since November 2010
Internet access: FiOS 15/5