Exchange for providing service functions for given periods of time
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United States of America Patent
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-
Aug 13, 2002
Grant Date -
Dec 27, 2001
app pub date -
Apr 10, 1997
filing date -
Apr 12, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A storage device has an operation effective value memory for storing operation start days, effective period deadlines, and number of effective days of service functions. A controller does not provide a service function when an extension telephone set is operated to use the service function if the present day is past an effective period deadline stored in the operation effective value memory.
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