Patent ID: 6434227
Filing Date: 2002-08-13
Classification: H04M

Abstract:
An exchange having a plurality of classified service functions, comprising:a main switch means for accommodating a plurality of terminals each terminal having an extension telephone operable without a calling card; an operation effective value memory for storing an operation effective value representing an effective period deadline of a service function or the number of times that the service function can effectively be used; and a control device for preventing the service function from being provided to one of said plurality of terminals if the effective period deadline is past, or the number of times that the service function has been used exceeds said operation effective value, said period deadline including a date after which said service function will be prevented, said service function being other than a connection of a pre-paid call; an advance warning memory for storing an advance warning day to warn a service person of the exchange or said one of said plurality of terminals of the fact that the service function will expire; and a warning device for warning said service person of the exchange or said one of said plurality of terminals if the present day is past said advance warning day; wherein said control device is operative without requiring a security code or authorization code to be input by a user of said one of said plurality of terminals.