| 摘要 |
PURPOSE:To interlock a PBX dial-in with a night switching service by retrieving the second memory means by day and night information discriminated by retriev ing the first memory means and an extension designating number signal of the first prescribed digit, determining the extension number of the second pre scribed digit and performing a calling processing to a corresponding extension terminal CONSTITUTION:A control part 19 receives the extension designating number, if it stored the extension designating number of the number of digits in a table D, for instance four digits of ZZZZ, a table A is searched by a binary search method and a storing position for ZZZZ is found, and then the state of a table E is read. If a real time is day, an incoming terminal CCC corresponding to the position where a table B is present is read, and if it is night, an incoming terminal ATT1 corresponding to the position where a table C is present is read. Thereafter, if the incoming terminal CCC or ATT1 is present in the PBX, the state of the incoming terminal is decided, and if it is idle, the incoming terminal is called up. If there is a response, the paths of the incoming terminal and a dial in trunk are turned on to operate a channel.
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