SG3-to-G3 fax spoof
US8441669B2 · kind B2 · utility
0Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2010 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Oct 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0093
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, an originating gateway receives a call menu (CM) signal from an originating fax machine. The CM signal may have been generated in response to an ANSam signal from a terminating fax machine. The originating gateway suppresses the CM signal after a preamble of the CM signal and generates a modified JM signal in response to receiving the CM signal. The modified JM signal indicates that V.34 half-duplex modulation is not an option. The originating gateway transmits the modified JM signal to the originating fax machine, which allows the transmission to continue across an unenhanced T.38 fax relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.