US Patent 7505406 Public telephone control with voice over internet protocol transmission

Controlled public telephone communication systems includes a plurality of telephones at a given site, a programmable control computer for switching, accessing, routing, timing, billing, and the control of the telephones at the site and a Voice over Internet Protocol (VoIP) network connecting the telephones to an off site public switched telephone network. The programming of the control computer is distributed to remote locations over the VoIP network. A data exchange network interconnects other sites with the telephone communications system being integrated into the data exchange network.