Private telephone management system including multiple private line outputs and account management means

摘要

An apparatus for providing added functionality to a private telephone system, said private telephone system having inputs for multiple trunk lines and having multiple private line outputs, said apparatus comprising: a processing unit for monitoring one of said multiple private line outputs and operable to perform said added functionality: a talk battery; and a switch having an input for a single telephone, and an output selectable between one of said multiple private line outputs and said talk battery, said switch being controlled by said processing unit in accordance with said added functionality; said processing unit also having means for managing user accounts.