Silent redial system for VoIP modem
US7082123B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2002 |
| Grant date | Jul 25, 2006 |
| Priority date | — |
| Expiry date | Jan 6, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/2749
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A redial system for a VoIP modem includes a subscriber line interface circuit (SLIC) for interfacing analog telephone signals from a telephone set to the VoIP modem and for generating redial signals to a public switched telephone network (PSTN), a first relay for connecting the telephone set with the PSTN or connecting the telephone set with the SLIC, a dummy load, a second relay connected between the PSTN and the dummy load for establishing or de-establishing a connection between the PSTN and the dummy load, a third relay connected between the first relay and the SLIC for establishing or de-establishing a connection between the first relay and the SLIC, and a control circuit for controlling the second and third relays to establish the connection between the PSTN and the dummy load and de-establish the connection between the first relay and the SLIC during the generation of the redial signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.