Please beware,  and don't respond to this message, the IRS does not call people and threaten them.

This message is copied from my Comcast readable voicemail:
Monday | July 18, 2016 | 1:23 PM EDT | 37 seconds
"Hello this call is officially a final notice from IRS Internal Revenue Service. The reason of this call is to inform you that IRS is filing lawsuit against you to get more information about this case file. Please call immediately on our department number 601-686-2645. I repeat 601-686-2645. Thank you."