Method of distributed call control in a distributed transit PBX system
US5805690A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Oct 7, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13389
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of Distributed Call Control is provided in a Distributed Transit Private Branch Exchange (PBX) comprising a plurality of Nodes forming a wide area network, and a plurality of D-channel Server Modules (DSMs). The DSMs are located in predetermined ones of the Nodes with each DSM coupled to at least one associated PBX via at least one D channel. The method includes the following steps. First, a listing of all Exchange Codes (ECs) handled by a DSM and each associated PBX coupled thereto is stored in a local routing table of a memory in the DSM. Second, a listing of all ECs handled by all of the other DSMs of the Distributed Transit PBX and their associated PBXs is stored in a remote routing table of the memory in each of the DSMs. Third, upon receiving a call request and an Exchange Code (EC) for a called PBX at a DSM from an associated calling PBX, determining at the DSM if the EC is found on the local routing table, and routing call back to the associated called PBX when a the EC is found on the local routing table. Fourth, determining if the received EC is found on the remote routing table for a remote DSM when the EC is not found on the local routing table. When the EC is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.