Fax transmission denial by sensing for CNG tones within a telephone network
US7006612B1 · kind B1 · utility
6Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2004 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Oct 15, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/32745
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.