I just called this number back and they said I was being sued, and if I wanted to "settle" my claim out of court I could do so. I told them it was a hoax and they told me that expect an arrest warrant out in my name.
This guy (John Wilson) who couldn't speak english told me I owed thousands of dollars to the IRS. He told me that I was going to Federal Prison if I didn't pay.
I asked him if I could bring my golf clubs to prison and he hung up.
Got a call from this number today and panic attack for 10 seconds before i recalled hearing something on NPR radio about IRS scam calls. looked up the number and was pointed to this site. good confirmation it's a scam from them