| 摘要 |
PURPOSE:To transmit repetitively a call signal to an extension to be called for a prescribed time interval by providing respectively a special number identifying device to an outgoing register and also an extension recalling control information storage device to a central controller and allowing dialing of the special number while a calling extension is calling an extension to be called. CONSTITUTION:Suppose that a calling extension A is calling an extension B to be called. When the calling extension A hooks on to set an unresponded extension recalling while the extension B to be called is unresponded, the calling extension A is connected to an outgoing register (ORT) 6 and a dial tone is to be listened to. Then the special number is dialed succeedingly. The outgoing register 6 counts and stores a dial pulse and transmits dial information to a special number identifying device (SNAU) 7 (via transfer route 1'). When the central controller 4 detects timeout (via transfer route A'), the allocated position information of the extension B to be called is read (via transfer route B') from an allocated position information storage circuit (ENM) of the extension recalling control information storage device 5, a call signal device (BGU) 3 is started (transfer route C'), and a call signal is transmitted to the extension B to be called. |
