Line control system adapted for a facsimile machine for detectin

Details Line control system adapted for a facsimile machine for detectin Line control system adapted for a facsimile machine for detectin

1990-09-17

1992-03-31

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379355, H04M 1100, H04M 100

Patent

active

051014289

ABSTRACT:
A line control system adaptable to a facsimile machine having access to a plurality of foreign telephone exchanges with different busy tone specifications for detecting a busy telephone signal in which a busy tone specification corresponding to each of the plurality of telephone exchanges is stored in a memory whether a dialed telephone number is associated with a respective one of the foreign telephone exchange is determined. The busy tone specification corresponding to the respective foreign telephone exchange is accessed from the memory based on the determination; and a busy signal received from the respective foreign telephone exchange when the dialed telephone number is busy is compared with the accessed busy tone specification to determine whether the busy signal is a valid busy signal.

REFERENCES:
patent: 4473720 (1984-09-01), Hegi
patent: 4741021 (1988-04-01), Kotani et al.
patent: 4741029 (1988-04-01), Hase et al.
patent: 4995076 (1991-02-01), Joffe et al.

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