Communication apparatus

Details Communication apparatus Communication apparatus

1992-03-27

1995-12-26

Friedman, Carl D.

Telephonic communications

Supervisory or control line signaling

Substation originated

379100, H04M 100

Patent

active

054795001

ABSTRACT:
A communication apparatus for performing auto-redial processing for repetitively calling a distant station using a prestored call number until a connection can be attained, includes a response state detection unit for detecting a response state of the distant station or an exchanger through a line after a calling operation is started, and a control unit for judging according to a detection state of the response state detection unit whether or not the call number is correct, and for, when it is judged that the call number is false, interrupting the auto-redial processing.

REFERENCES:
patent: 4641133 (1987-02-01), Ono
patent: 4741021 (1980-11-01), Kotani et al.
patent: 4811385 (1989-03-01), Watanabe
patent: 4910506 (1990-03-01), Yoshida et al.
patent: 4956860 (1990-09-01), Murata
patent: 5077787 (1991-12-01), Masatomo
patent: 5125025 (1992-06-01), Lim
patent: 5151933 (1992-09-01), Abe

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