Method and apparatus for determining when a telephone handset is off-hook
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United States of America Patent
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-
Sep 18, 1990
Grant Date -
N/A
app pub date -
Apr 19, 1988
filing date -
Apr 19, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus in an automatic telecommunications system which communicates between a central location and at least one remote location over the switched telephone network, senses changes in loading of the telephone line which correspond to a telephone going off-hook, to serve as an indication that a telephone has gone off-hook and to cause the automatic telecommunications system to relinquish its use of the telephone line, or not to go off-hook if a telephone is in use.
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Cited Art Landscape
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