Didn't AT&T or someone offer a deal where you pick a few numbers, say " 3 6 1" and anyone dialing in had to dial those 3 digits, or 5 digits or......you get the idea.......if the caller did not know those digits, the call would not go through.

Of course it cost another $$$ a month. The cheap way out is to let your answering machine take the call. PROBLEM IS, A LOT OF DOCTORS USE "Private Caller" and ...... I guess they get to leave a number or if you hear them, grab the phone.