| 摘要 |
A telephone exchange apparatus for plural extension telephone units is capable of interchanging, in response to a predetermined operation from one of the extension telephone units the extension numbers of two extension telephone units and the associated information stored in advance for these extension telephone units, such as individual one-touch dialling data, abbreviated dialling data and re-dialling data. In response to the predetermined operation, the exchange apparatus interchanges the data areas in a memory respectively corresponding to the physical addresses of the extension telephone units.
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