Apparatus for combining cellular telephone ring signals and PSTN ring signals
US5787365A · kind A · utility
15Cited by
13References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Apr 24, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/7243
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A ring detection device which signals a modem in a personal communication device. A detector is connected to the cellular radio telephone for detecting an incoming telephone call. An oscillator circuit generates a ringing signal for enabling a modem in response to either the cellular telephone incoming call or a ring signal received over a directly-connected PSTN network. The modem for the personal communication device responds for providing communication over either the cellular network or directly-connected PSTN network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.