| 摘要 |
PURPOSE:To prohibit the incoming of a call unconcerned, by storing the identification number of a call opponent by only hooking in communicating and a specific dial, and accepting only the incoming from the call opponent hereafter. CONSTITUTION:When the hooking of an extension 101 is performed in communicating, a central processing unit 400 connects a register trunk 200. Next, when the extension 101 dials a specific number, the identification number of an extension 102 that is the call opponent is confirmed, and the identification number of the extension 102 is stored in a memory device 500 by corresponding it to the extension 101. After completing the call, when an extension 103 calls the extension 101, the central processing unit 400 reads out the information of the extension 101 from the memory device 500, and identifies the correspondence of the extension 102 on the call opponent of the extension 101, and sends a busy tone to the extension 103. Also, when the extension 102 calls the extension 101 again, the call of the extension 101 can be performed based on the above correspondence.
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