A federal court has ruled Oklahoma can set its own rates for in-state phone calls from behind bars.

The U.S. Court of Appeals in Washington, D.C., struck down parts of a Federal Communications Commission order that capped how much money prisoners pay to make calls.

In 2015, the FCC ordered that in-state calls could not cost more than 49 cents per minute, depending on the size of the facility. The court struck down the order because states have the authority to regulate in-state calls. The FCC's rate caps on interstate calls remain in place.

Under the FCC's rule, the Oklahoma Department of Corrections charges 20 cents per minute; before the regulation, inmates were charged $3 per call.