| 摘要 |
a means for comparing the registration number of a handset and that of a base; a means for changing the registration number of the handset when its number differs from the registration number of the base; a base registration number changing means for updating the registration number of the handset as the sub registration number of the base; a memory for searching for the extension number of the handset using the registration number of the handset transmitted to the comparing means; and a call signal transmitter for generating all calling signals transmitted to the base of the handset according to the output signal of the memory as the base.
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