| 摘要 |
A tracking connection system includes a portable telephone set and a plurality of switching units. The portable telephone set receives a calling signal containing a called number and sends a response signal. Each switching unit has a unique management area, in which communication is performed with the portable telephone set, and transmits a calling signal to the portable telephone set present in the management area. Each switching unit includes a memory, a detecting section, and a tracking destination deciding section. The memory serves to store tracking sequence data indicating a sequence for tracking the portable telephone set in advance. The detecting section detects whether the portable telephone set as a calling target is present in the corresponding management area. The tracking destination deciding section decides the switching unit at a tracking destination of the portable telephone set as the calling target on the basis of the tracking sequence data in the memory, when the detecting section does not detect the presence of the portable telephone set.
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