Apparatus and method for transmitting-receiving CID in a PBX
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United States of America Patent
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Jul 24, 2007
Grant Date -
Oct 21, 2004
app pub date -
Jul 21, 2003
filing date -
Jul 22, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A PBX connected to a public exchange includes a separate caller ID service unit for providing a caller ID and/or a system tone by performing a digital signal process. To display the caller ID on a receiver terminal, or caller ID phone, a line is established with the PBX through general switched telephone network, and a CID received through the line is converted and stored in the caller ID service block mounted with at least one memory through a switching block, under control by a control block. Then, the control block transmits all or part of the stored CIDs to the caller ID phone through the switching block and/or a subscriber line convergency unit.
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