[cmdkeen]

There's a new device in the UK, "BT Call Guardian" which basically has a whitelist/blacklist system and then anyone else gets answered by the device, without your phone ringing. The device explains what is going on and asks the caller to say their name. The phone then rings and the device says who is calling and you then decide whether to answer, ignore or add to blacklist.

One of my colleagues absolutely swears by it.

[kennydude]

I'm sure this is a rebadged thing as I've heard of something similar a few years ago, so it should be better than BT doing it themselves.