Secretary telephone system

Details Secretary telephone system Secretary telephone system

1984-06-06

1986-04-15

Schreyer, Stafford D.

H04M 342

Patent

active

045829586

ABSTRACT:
In a secretary telephone system for calling a transfer destination telephone set through given local lines of a telephone set different from a called party telephone set upon reception of a call from a calling party telephone set to the called party telephone set, the calling party telephone set can receive a busy signal in response to an output generated from a busy tone detector for detecting the busy tone when the transfer destination telephone set is set in an off-hook state. In addition, when a person at the transfer destination telephone set does not answer the phone within a predetermined period of time, the busy tone can be sent to the calling party telephone set in response to an output generated from a timer arranged therewith.

REFERENCES:
patent: 3689702 (1972-09-01), McCay
patent: 3704346 (1972-11-01), Smith et al.
patent: 3965306 (1976-06-01), Watkins
patent: 4061885 (1977-12-01), Nash et al.
patent: 4092499 (1978-05-01), Lofmark
patent: 4117270 (1978-09-01), Lesea
patent: 4277650 (1981-07-01), Arend et al.
patent: 4352194 (1982-09-01), Caracappa
patent: 4413158 (1983-11-01), Danford
patent: 4439639 (1984-03-01), Munter
Brady et al., "Busy Call Diverter", IBM Technical Disclosure Bulletin, vol. 25, No. 4, Sep. 1982.

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