The rule in our family for a number of years now has been, "If the number is not in your address book, let it go to voicemail." We have the landline ringer off

The rule in our family for a number of years now has been, "If the number is not in your address book, let it go to voicemail." We have the landline ringer off and always let it go to voicemail. As an 80/20 solution, it's been remarkably effective so far.