PBX telephone call control system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 24, 1988
Issued Date -
N/A
app pub date -
May 6, 1985
filing date -
Sep 28, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A PBX telephone call control system is disclosed. The system provides a line interface unit connection between a plurality of subscriber line extensions and a private branch exchange (PBX or Centrex equipped) switching equipment. The call control system appears to the PBX like any other telephone extension within the office environment and provides the user with more features in conjunction with the pre-existing PBX equipment, providing expanded capabilities at a reasonable expense.
First Claim
Family
International Classification(s)
Cited Art Landscape
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