Telephonic communications – Multi-line or key substation system with selective switching... – With special service
Reexamination Certificate
2007-07-24
2007-07-24
Tran, Quoc (Department: 2614)
Telephonic communications
Multi-line or key substation system with selective switching...
With special service
C379S165000, C379S142010, C379S142070, C379S198000
Reexamination Certificate
active
10622467
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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KED & Associates LLP
LG-Nortel Co., Ltd.
Tran Quoc
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