Yep, got a few calls from this number today. They stated I am being sued by the IRS. I knew it was a scam but called them back. I gave the guy a fake name. He said "no it's not, don't waste my F***ing time C*** sucker". And then he hung up.
Called three times (EST: 12:52 pm, 3:12 pm, 6:27 pm) and left an automated voice message that I need to call back as IRS is to sue me. I never did; I knew instantly it was a scam.
Two caveats: 1) the third call was originated from a different number (202) 864-1183, yet left the same voice message; 2) the country code all three calls came from was "011" which is Russia; despite the fact, the automated voice message was in good English (by a a native speaker, not a foreigner).