Circuitry for providing executive ringback in a PBX system

Details Circuitry for providing executive ringback in a PBX system Circuitry for providing executive ringback in a PBX system

1974-10-03

1976-05-11

Cooper, William C.

H04M 348

Patent

active

039565955

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 at the conclusion of the conversation between the called party and the third party by ringing back the calling party provided the calling party is equipped with the class of service which permits executive ringback. The ringback feature is initiated by the calling party upon receipt of a busy tone by a flashing of his switchhook.

REFERENCES:
patent: 2753401 (1956-07-01), Pharis
patent: 3517139 (1970-06-01), Whitney
patent: 3676606 (1972-07-01), Gueldenpfennig et al.
patent: 3854014 (1974-12-01), Akin et al.

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