These guys have sweat shops set up in India and elsewhere that do VoIP call forwarding so it looks like they are from the US but they are not. They have auto dialers to do DoS (Denial of Service) on companies and light up the entire switchboard. They are extortionists that are scaring people into sending money. We called the around, even the FBI, and nothing can be done. If you call the carrier from where this number originates, they will shut the number down but that is only an irritant for them and doesn't solve anything. All you can do is don't talk to them and they will get bored and move along.