This is a scam caller with a recording saying this is the final message from the irs, blah blah blah. Don't even think about answering it. You'll just be setting yourself up for more scam calls. On my caller id it says it's coming from a wireless caller.
Got a call from some jerks - caller ID showed "WIRELESS CALLER'. A message was left and was exactly as follows, "The reason of this call is to inform you that IRS is filing lawsuit against you. To get more information about this case file, please call immediately on our department number 213-280-5752 bye repeat 213-280-5752 thank you". REALLY?!