Exact same as Nancy S, except that I called the number back. When I told the man who answered that I wanted to be put on the "Do Not Call" list, he laughed and hung up.
I got a call from this number this morning. Since I screen my calls, I did not pick up. They claimed to be from the IRS and that the IRS was suing me and I MUST call back. Yeah, fat chance. Instead, I reported the scam and hope the government prosecutes them. If you get a call from them, please get more information and report it at http://www.consumer.ftc.gov/articles/0048-government-imposter-scams