A call management system is disclosed that may interface with an existing PBX or may be utilized as a separate unit. In a preferred embodiment, the call management system includes a tariff data server, a local client computer and one or more line units. The tariff data server holds tariff data...http://www.google.fr/patents/US5799072?utm_source=gb-gplus-shareBrevet US5799072 - Telecommunications call management system
