I received the same call claiming the same information. I called back four times. Each time East Indian sounding voices, with all American names. Claimed they were in Washington DC... Idaho area code. They hanged up each time if I asked any questions at all.
The call is fraudulent. We suspect they're getting contact info from iRS filed tax liens which are public record. The callers are generally foreign and if you stay on the phone long enough they will instruct you to get a money card to pay them with. Some cases have reported that these callers will call and report a crime in your area before they call you in order to claim that the police car you see on your street is coming after you. IRS DOES NOT ask for money by phone nor do they call you to tell you you're being sued. IRS sends a letter or agents to your home. These calls seem to go in spurts every few months. Hang up, block the caller.