Didn't answer, but a voice message was left. It was a recording telling me that a law suit is being filed against me by the IRS, and to call the number back to receive more information. I did not call back, as I don't believe this is legitimate. I received this call last night, and two more this morning (one of which woke me up at 6:30 a.m.) from a different number (347-669-5232) that left the same message.

Claimed to be the IRS.  This is a scam number.

Same..claim to be IRS and that I'm being sued.

Same here, computer voice left message claiming it's an emergency that I call back.

Same here. Computer voice left a message about a case against me. This is scam number.