The U.S. Federal Communications Commission (FCC) also promulgated regulations under the TCPA. Most of these regulations were designed to reduce the liability of senders of junk faxes. For instance, the FCC created an exemption for fax broadcasters similar to the "common carrier" exceptions created for telephone companies and an exemption for advertisements sent to recipients with whom the sender had an existing business relationship ("EBR") if the sender included a proper opt out clause. While many defendants in junk fax suits attempted to rely on these regulations, they were almost uniformly unsuccessful because courts repeatedly ruled that the FCC had been without statutory authority to create such exceptions.