Method and apparatus for preventing return dial tone fraud in a cellular paystation
US5818916A · kind A · utility
3Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1995 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cellular paystation system has a transceiver, paystation and an interface. The cellular paystation system operates to prevent return dial tone fraud by providing from the interface a first dial tone to a calling party using the paystation when an off-hook condition is first detected at the paystation by the interface, and then preventing another dial tone from being provided to the calling party until an on-hook condition of the calling party is detected by the interface at the paystation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.