I received a voice message on my answering machine purporting to be from the IRS which is "announcing it is filing suit against me" and to call this number. Needless to say, I'm not. This occurred 4/29/15 at 5:37 PM Eastern Time.
Got 2 calls from this number 202 684 6574 just like the above messages. They left a voice message stating I was being sued by the IRS and to call this number which is supposedly their "department". It's a scam. The IRS will mail information out not leave a voice message if they want to notify you of anything especially something as important as a suit.