It's a scam call claiming to be IRS. Do NOT call the number back. Report these calls to the IRS scam page:
https://www.irs.gov/uac/report-phishing?_ga=1.177345253.11771534.1454553550
IRS scam. Robot voice wanting a call back "if you don't call me back, good luck as all this unfolds on you!" lol! Pretty bad but I guess a lot of people are gullible.
Got a phone call from this number yesterday. Sadly I couldn't hear who they were calling for so I called them back. Big mistake. They wanted to search if I was in their system. Only gave my name and zip and of course they went off on some big issue about my taxes and the arrest warrant out for me. They also tried to read me an affidavit which I declined and hung up on them. They tried to call back today and I didn't answer. strange they didn't want to leave me a voice mail this time....