In the United States, a modification (2005) to the Telephone Consumer Protection Act (1991) and Federal Communications Commission (FCC) rules that defines an existing business relationship (EBR), codifies an existing EBR exemption to the prohibition to sending unsolicited fax advertisements, requires the sender to provide details as to how the recipient can opt out of future faxes, and specifies the circumstances under which a request to opt out complies with the Act. See also fax, FCC, and Telephone Consumer Protection Act.