I received a voicemail at 3:06 PM on 9/28/16 from 512-994-3451. A woman's computerized voice said ... "IRS is filing lawsuit against you ..." It's a scam!
I received the same call. I hung up and then decided to call back. I guy with a heavy Indian accent answered, "Internal Revenue Service, may I help you". I hung up again. This is definitely a scam.