Abstract: A format-converting device couples a control device controlling an extension with a private branch exchange (PBX). A memory stores a converting table, which brings a first command data into correspondence with a given function and stores the first command data and the given function, a telephony application programming interface (TAPI) function and a telephony service provider interface (TSPI) function. A converting section calculates the given function based on the received first command data referring to the converting table. A first calculating section calculates the TAPI function. A second calculating section calculates the TSPI function. The first calculating section calculates based on a calculated result of the converting section. The second calculating section produces a second command data based on a calculated result of the first calculating section, where the second command data differs from the first command data. The second command data is sent to the PBX.

Abstract: It is characterized by a call center server equipped with selection means 55 connected to an exchange which forms a talk channel between an external line and a plurality of extension telephones and selects a call reception destination of the selected call from the external line, and sets up it as a call reservation destination, call reservation means 56 which associates the selected call from the external line with an extension telephone as the call reservation destination, and stores them as talk reserved call information, in storage means, and extension line control means 52 which transmits, on the occasion that an extension telephone of talk reserved call information became available to receive a call, such notification that a distribution waited call, which can not be received by this extension telephone, is allowed to be received, to the exchange.

Abstract: A format-converting device couples a control device controlling an extension with a private branch exchange (PBX). A memory stores a converting table, which brings a first command data into correspondence with a given function and stores the first command data and the given function, a telephony application programming interface (TAPI) function and a telephony service provider interface (TSPI) function. A converting section calculates the given function based on the received first command data referring to the converting table. A first calculating section calculates the TAPI function. A second calculating section calculates the TSPI function. The first calculating section calculates based on a calculated result of the converting section. The second calculating section produces a second command data based on a calculated result of the first calculating section, where the second command data differs from the first command data. The second command data is sent to the PBX.