It's a SCAM! I received call from it as well, and when call back, they were able to pull up my last name and prior address, indicated that they sent notification to the address that was my prior address, and even told me the year of tax and amount that I owed.
Recieved a call from this number and did not answer it. A voice mail ensued and claimed to be IRS informing me that this was the last attempt to contact me before a law suit would be persued and said to call them at this number. IRS will not call your cell or home telephone. Obviously a scam.