Sounds very much computer-generated, but I can see that some people may fall for that.
The issue at hand is extremely time sensitive. My name is Officer Liz Smith calling you from the Internal Revenue Services in the hotline to my division is 917-231-1777. I repeat. Once again, 917-231-1777. The reason behind our call is to inform you about the lawsuit, which has been filed under your name. So give us a call back as soon as possible.
The issue at hand is extremely time sensitive. My name is Officer Mark Benson calling you from the Internal Revenue Services, and the hotline to my division is 917-285-1104. I repeat. Once again, 917-285-1104. The reason behind our call is to inform you about the lawsuit, which has been filed under your name. So give us call back as soon as possible.
BrianChan.us 
I got this call EARLY in the morning. Before 6AM which in itself is highly suspect. I don’t care who you are or where you are, it’s highly unlikely the IRS will be calling the west coast at this time of morning.
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just got one of these calls this morning (early, before 0600).
The closing sentence isn’t articulated correctly: “so give us call back as soon as possible”.
Highly suspect-
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