Voice-over internet protocol
US6829249B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Aug 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2207/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method is designed for upgrading a digital PBX used with a pulse code modulation (PCM) telephone system by providing an interface card connected to the back plane of the PBX. The interface card acts as a replacement for the digital key set cards normally used with the back plane of such a PBX. The interface card is designed with circuitry to process voice-encoded packet data directly from a LAN to the PCM data used within the PBX network, and to process PCM data from the telephone network to voice coded packet data on the LAN to provide a voice-over Internet protocol and interface with the telephone system connected with and controlled by the PBX.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.