We received the following robo call on our answering machine at 11:59 am from 202 738-1074 (Male voice):
"IRS is filing a lawsuit against you either press 1 to get connected with your case officer or call immediately on our department number 202 738 1074 I repeat 202 738 1074."
A few months ago we received a very similar message but from 206 801 1872. And again, recorded it as follows (Female voice):
"The reason of this call is to inform you that IRS is filing lawsuit against you, to get more information about the case file please call immediately on 206 801 1872 I repeat 206 801 1872 I thank you."
It is interesting that a few of the small words are missing like "the" IRS and "a" lawsuit.