| 摘要 |
A key telephone system is disclosed including a key service unit to which are connected a communication network such as public telephone network, a plurality of data terminal equipments such as personal computers, and interface conversion unit such as MODEM. When a call comes from external calling party into this system, the key service unit establishes a communication path between the network and the interface conversion unit so that succeeding data transmitted from the calling party supplied to the interface conversion unit. The succeeding communication data includes an extension number selected by the calling party, and the extension number is informed to the key service unit from the interface conversion unit. Then, the key service unit establish a communication path between a single data terminal equipment designated by the extension number and the interface conversion unit, so that the calling party can communicate with the designated data terminal equipment.
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