IP telephone system
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United States of America Patent
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Aug 18, 2009
Grant Date -
Sep 28, 2006
app pub date -
Mar 9, 2006
filing date -
Mar 10, 2005
priority date (Note) -
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Abstract
(backup TM), and therefore, even when a fault occurs in the IP exchange or the circuit, the IP terminals inside the lodgment are backed up and the actuations of the IP terminals are continuously operated, and for example, the extension phone calls inside the lodgment can be realized.
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