Telephone switching system having automated call hold facilities

Details Telephone switching system having automated call hold facilities Telephone switching system having automated call hold facilities

1975-07-02

1977-05-10

Cooper, William C.

H04M 342

Patent

active

040229831

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.

REFERENCES:
patent: 3859474 (1975-01-01), Gueldenpfennig et al.

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