**SCAM** Boiler Room Telemarketers. These are the same people who operate "Rachel, Card Member Services Scam". DO NOT GIVE THEM ANY OF YOUR PERSONAL INFORMATION. This company operates/sells information to call centers in India too.
I upgraded my call blocker from a CPU blacklist call blocker with a Sentry 2 call blocker and an AT&T DECT phone. It blocks every call except for the numbers on your white list.
If you have a live person that you want to talk to call that is not in your white list it gives a recording that tells them to dial "0" and be added to the white list. Since most spam calls are robocalls it blocks those.
You may eventually get a spam call from a real person who will dial "0" and get on your white list. All you have to do is transfer the number from the white list to the black list. Problem solved.
I like the AT&T phone because it shows the caller ID, but doesn't ring for blocked calls.
Robocall left no message but stayed connected long enough to trigger the phone company's, "If you'd like to make a call, please hang up and dial again."