Fax transmission denial by sensing for CNG tones within a...

Details Fax transmission denial by sensing for CNG tones within a... Fax transmission denial by sensing for CNG tones within a...

2006-02-28

2006-02-28

Chan, Wing (Department: 2643)

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

C379S100010, C379S093020, C379S210020, C379S142060

Reexamination Certificate

active

07006612

ABSTRACT:
A presence of a facsimile transmission tone generated by a calling party within a call is sensed for within a public telephone network before the call has been routed to a called party. If the facsimile transmission tone is present in the call, the telephone network denies completion of the call to the telephone line of the called party. If the call is absent the facsimile transmission tone, a telephone network switch is instructed to complete the call to the telephone line of the called party.

REFERENCES:
patent: 5060255 (1991-10-01), Brown
patent: 5467388 (1995-11-01), Redd et al.
patent: 5936744 (1999-08-01), Choi
patent: 6160877 (2000-12-01), Tatchell et al.
patent: 6239881 (2001-05-01), Shaffer et al.
patent: 6647099 (2003-11-01), Durkin
patent: 6741688 (2004-05-01), Yau

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