While immediately blocking all unknown numbers may well be excessive, I'd like a feature where all known good numbers (my "white list") go straight through, all

While immediately blocking all unknown numbers may well be excessive, I'd like a feature where all known good numbers (my "white list") go straight through, all known bad numbers (my "black list") don't even cause the phone to ring, and all other numbers go straight to voicemail. They'd be easy to review at my leisure for addition to my white or black list and the phone spammers would never again interrupt the peaceful enjoyment of my dinner.