Communication terminal unit for connection to an ISDN
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United States of America Patent
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Feb 23, 1993
Grant Date -
N/A
app pub date -
Sep 9, 1991
filing date -
Sep 10, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to communication terminal units connected to an ISDN (Integrated Services Digital Network), and more particularly to a communication terminal unit whose response is limited by a user number, a subaddress and ability specification information included in a call set-up signal sent from a calling terminal. The communication terminal unit of the invention allows an identification code common to terminals in each department to be added, thereby simplifying the number management.
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