Network support for fax retry blocking

Details Network support for fax retry blocking Network support for fax retry blocking

2006-01-17

2006-01-17

Chan, Wing (Department: 2643)

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

C379S100010, C379S210020, C358S468000

Reexamination Certificate

active

06987843

ABSTRACT:
A method is provided for fax call blocking. The method includes: receiving a first call intended for an end instrument (10) employed by a user; obtaining a telephone number from which the first call originated; comparing the obtained telephone number against a first database (42) to determine if the obtained telephone number matches a blocked telephone number contained in the first database (42); blocking the first call such that the end instrument (10) is not alerted if a match is found between the obtained telephone number and a blocked telephone number, otherwise providing a connection to the end instrument (10) for the first call; monitoring the connection to detect for fax tone; and, entering the obtained telephone number in the database (42) as a blocked telephone number if fax tone is detected.

REFERENCES:
patent: 6239881 (2001-05-01), Shaffer et al.
patent: 6256116 (2001-07-01), Nawrocki
patent: 6721059 (2004-04-01), Sturgeon et al.
patent: 6721071 (2004-04-01), Maruyama
patent: 2004/0146153 (2004-07-01), Solin
patent: 2005/0012966 (2005-01-01), Mitchell et al.

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