Here's an automated transcription of the robocall:
Hi my name is David Gray. This message is intended to contact you regarding an enforcement action executed by the United States treasury and needing your serious attention. Ignoring this will be an intentional second attempt to avoid initial appearance before magistrate judge for a grand-jury for federal criminal offense. My number is 606-259-9417. I repeat it's 606-259-9417. I'd like you to call with us and help us to help you.
As the others noted, male, middle eastern accent, serious, almost threatening tone. This is the second of these types of scam calls I received. I actually got a live person on the last one, and he threatened me - said he was an "officer". I hung up and he called back, again threatening. I said to hold on, as I was going to conference in the police so we could get this straightened out - of course, he disconnected immediately.
Has called twice to say we are in legal trouble and will have to go before a US Magistrate and of course, he can help us out! Male, Indian accent. Scam, scam scam!
They left a message saying this was a Federal enforcement action, and that if I did not call them back, it would be a failure to cooperate with the Federal authorities. They finished by saying "help us to help you".
My phone in the Fraud Unit is ringing off the hook. Instead of celebrating Diwali these people are harassing our citizens with calls of being incarcerated if they don't settle their debt to the IRS. These Scammers are making a long day short, but my ear is burning!
Just called with recorded message. Said his name was David Gray and told me I better call him back this was my second notice. I would have to appear before a federal magistrate etc. all scam, scam, scam. Indian mans voice don't answer of call him back. Scam, scam, scam!