Circuitry for providing call override in a PBX system

Details Circuitry for providing call override in a PBX system Circuitry for providing call override in a PBX system

1974-10-03

1976-03-16

Cooper, William C.

H04M 320

Patent

active

039447502

ABSTRACT:
In a telephone switching system wherein a plurality of line circuits are terminated in station sets, the line circuits are interconnectable to a plurality of trunk circuits through a multistage switching network. A call originated by a calling party to a called party, engaged in a conversation with a third party, is completed by overriding the conversation between the called party and the third party provided the calling party is equipped with a class of service which permits call override. Call override is initiated by the calling party upon receipt of a busy tone by a flashing of his switchhook.

REFERENCES:
patent: 2444033 (1948-06-01), Cohrt
patent: 2823264 (1958-02-01), Pharis

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