In a decision likely to impact future litigation over robocalls and texts, a federal appeals court Friday struck down key parts of a Federal Communications Commission order that had expanded the legal definition of an autodialer.

The FCC’s 2015 declaratory ruling and order has been sharply criticized by defense attorneys and representatives from the U.S. Chamber of Commerce, who say it exposes companies to huge penalties under the Telephone Consumer Protection Act, or TCPA, even when making tailored marketing or business calls.