Internet protocol compliant private branch electronic exchange and a method expanding the number of controlled terminal ports
US7580402B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2003 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Dec 11, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13389
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The IP-PBX 1 includes a multimedia gateway controller 2 in which a call control data master table stores call control data for all terminals falling under the control of the IP-PBX and protocol handlers which are installed on a system bus 101 or expansion system bus 102 in a sufficient number for serving the number of circuits accommodated by the IP-PBX. On each of the protocol handlers, a microprocessor performs processing tasks corresponding to a load shared on it in interfacing with a given number of terminals, using a call control data slave table in its memory, call control protocol conversion function, fault-supervisory-processing function, call control protocol retransmission function, call control protocol transfer function, and terminal supervisory function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.