Patent · US Expired

Telephone switching system having automated call hold facilities

US4022983A · kind A · utility

105Cited by

1References

17Claims

0Family size

Assignee

Bell Telephone Laboratories, Inc. · US

Inventors

Edwin Braun · Allensbach, DE
Michael Stephen Lane · Keyport, US
Henry August Meise, Jr. · Boulder, US
George W. Taylor · Oak Creek, US

Key dates

Filing date	Jul 2, 1975
Grant date	May 10, 1977
Priority date	—
Expiry date	Jul 2, 1995

Classification

Technology area (CPC H)Electricity
CPC primaryH04Q3/625
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A wired logic PBX switching system is disclosed in which a camp-on circuit is used to provide automated call hold service. A station user places an existing call on hold by flashing the station switchhook contacts and dialing a predetermined code. The dialing of the code disconnects the station from the first call and places the trunk circuit serving the first call on hold. A second call may then be placed from the station. Upon termination of the second call, the hold condition is removed from the trunk circuit and a connection is reestablished from the trunk circuit to the station.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.