The Ninth Circuit also relied on agency interpretation of the common-carrier exemption by both the FTC and the FCC, noting that both agencies have long supported an activity-based approach to the common carrier exemption. Rejecting AT&T’s argument that telecommunications providers must be regulated solely by the FCC, the court found that concurrent jurisdiction is commonplace among federal agencies, citing for example the shared jurisdiction of the FTC and the Department of Justice with respect to antitrust matters.