IRS Lawsuit Scam number. Don't answer, don't call back!
This is just another one of the thousands of spoofed numbers used to call people to try to scare/scam them into paying to settle a non-existent law suit from the IRS. Best not to answer, but if you do, just don't fall for it... it's not the IRS, and no police or anyone else will come to your house to collect. They literally don't even know who you are or where you live. They will ask you to confirm your name, just give them a fake name and they proceed like it is your real name... so they don't have your name.