Have been receiving multiple calls from this number as well as other numbers including one from a DC area code with the same message about the lawsuit the IRS is filing against me. It's a total scam. I called back and of course, it's a number that has been re-routed from India. You can hear everyone in the background talking - all with Indian accents, but they have very American names which they take off the IRS website. It's annoying as hell.
Received a robocall from this number telling me that I'm being sued by the IRS, that this is my final notice, and to call the number right away. I did not call back.