Attorneys general from Arizona, Indiana, Michigan, North Carolina, Wisconsin and the district attorneys' offices of Los Angeles County and Riverside County on behalf of California are involved in the suit.

Indiana is among the states working with federal authorities on "Operation Income Illusion," a yearlong nationwide law-enforcement sweep targeting scammers.

Federal court officials in Indianapolis are warning that scammers posing as court employees are calling people with cases pending before the court and asking them for their Social Security number.

Hoosiers reported losing more than $16 million from robocall scams last year. Federal and state authorities across the country announced Tuesday a crackdown on the illegal calls.