Telephone call security system
US5022067A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Apr 20, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S379/903
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone call security system uses a long distance carrier access switch to prevent unauthorized access to the carrier by causing the switch control system to request a telephone identification serial number from the telephone and deny access if the serial number is not valid or if the number dialed is not an authorized number for the telephone whose serial number has been received. In addition, the system uses a coded query/response dialogue between the telephone and the switch control system for added security. The system may be implemented by modifying the carrier access switch control software and also includes a unique telephone and telephone resident control software.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.