Had a missed call from this # the caller id said Corte Madera, CA. Did a reverse phone look up on it and it said the carrier was Google Voice. Didn't call it back.
Official IRS Government site detailing this scam and providing links to report it:
http://www.irs.gov/uac/Newsroom/IRS-Warns-of-Pervasive-Telephone-Scam
The call I received today showed Larkspur California on my caller ID.! I immediately blocked it using my call Blocker device after googling the number. I unplugged my answering machine so anyone who calls will only reach a ring and nobody ever picks up. Of course if I am home and it is a number I know then I pick up LOL I have also filed a complaint with do not call. ,