Same as others. This is a scam. Please do not respond. Insightful article about how a journalist almost fell for this: http://narrative.ly/stories/how-i-fell-face-first-for-an-epic-irs-scam/
Yes, I just received the same call on my MOBILE phone. I attempted to call them back but the line was BUSY! Why do scammers pull this crap?? Because unsuspecting people will actually give them their ID & Security information because it is for the "IRS". NOTE TO EVERYONE: The IRS will NEVER contact you by phone - it is always by MAIL - ONLY!!