Working of EPABX

A telephone exchange serving a single organization, having a switchboard and associated equipment, usually located on the customer's premises; provides for switching calls between any two extensions served by the exchange or between any extension and the national telephone system via a trunk to a central office. Abbreviated PBX. (Sci-Tech Dictionary) For the source and more detailed information concerning your request, click on the related links section (Answers.com) indicated below this answer box.