Two automated messages left on answering machine on 10/16/2014 from someone claiming to be with IRS. The messages were identical and the caller's name was "Officer Julie Smith with the IRS" stating that "the issue at hand is really time sensitive" and "Don't disregard this message and do return the call before we take any legal allegations against you. Good bye and take care." The number was 415-506-1286 from Novato, CA. This is a scam. According to the IRS website, if IRS needs to contact an individual, it will be in letter form through the US Mail. I filed a complaint with the FCC. According to FCC's website, there are multiple scams from scammers purporting to be with IRS.
I got the call too. It didn't take too long for me to determine that this is likely a scam call. It looks like this post confirmed that as well. I was thinking of reporting this incident to the local police as well as to the IRS hoping it will help them to catch these scammers some day.