Telephone exchange system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 4, 1995
Grant Date -
N/A
app pub date -
Sep 1, 1993
filing date -
Mar 1, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone exchange system useful for a bank or brokerage house speech system or the like, which can accommodate a large number of lines (or trunks) and permit improvement of the reliability and call connection processing capacity. The system comprises exchange sub-systems A (EX-A) and B (EX-B) capable of independently executing an exchange operation and each accommodating a terminal. The terminal, on the other hand, has a speech channel switch for connecting a speech channel including a handset to either exchange sub-system A (EX-A) or B (EX-B). When a process of connecting a call is brought about in the terminal, that terminal selects one of the exchange subsystems and controls the speech channel switch for connecting the call to the selected exchange sub-system.
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