Scam involving supposed Social Security suing you and that you must give them money to stop the action against you. This is a residential landline not the IRS. They may be spoofing the number.
This is a well known scam which has received national attention. Per the IRS and Soc Sec, they never call you and ask for money. Most all first contact with those agencies come by USPS mail and not by phone for this very reason, you don’t know who is on the other end of the line.