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Communications
Class Information
Number:
379/297
Name:
Telephonic communications
>
Centralized switching system
>
Switching controlled in response to called station addressing signal
> Having specified busy-idle test
Description:
Subject matter including equipment to determine whether or not a component desired for use is already in use.
Patents under this class:
Patent Number
Title Of Patent
Date Issued
6810430
Network communications coupler
Oct. 26, 2004
6052461
Method and apparatus for maintaining real-time busy status information of telephone extensions in a private branch exchange
Apr. 18, 2000
4792969
Line condition data collecting system for a telephone exchange
Dec. 20, 1988
4049922
Switching arrangement for telecommunication switching systems
Sep. 20, 1977
4041245
Switching arrangement for telecommunication switching systems
Aug. 9, 1977
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