Return answer-supervisory circuit

Details Return answer-supervisory circuit Return answer-supervisory circuit

1975-06-16

1976-08-31

Cooper, William C.

179 18AH, H04M 706

Patent

active

039782948

ABSTRACT:
A PBX system is disclosed having a return answer supervisory circuit in a local PBX for automatically detecting and extending an answer indication from a called station located in a distant PBX to an attendant's console in the local PBX on tie trunk calls between the local and distant PBXs. The disclosed system is an improvement in the art in that it does not require major modification to existing equipment for returning the answer indication to the attendant's console.

REFERENCES:
patent: 2827517 (1958-03-01), Armstrong
patent: 2841653 (1958-07-01), Pharis
patent: 2915591 (1959-12-01), Pedrick
patent: 3549817 (1970-12-01), Peady
War Department Technical Manual TM 11-335, Telephone Central Office Set TC-1, 15 Apr., 1942 pp. 39-43.
Proc. of 1970 International Conf. on Communications: "Solid State Miniature Tie Trunk Circuit" by R. R. Maxon pp. 43-47 thru 43- 16, 1970.

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