Voice security between a composite channel telephone communications link and a telephone
US6256491A · kind A · utility
3Cited by
17References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1997 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Dec 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/033
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for security of individual communications over a composite communications channel such as T1 or E1. The composite channel is digitized. Individual channels are separated, but identifying information of each channel is retained. A level of security can be chosen for each channel by digitally processing the selected call with a selected level of scrambling or encryption prior to passing the call to an end-user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.