Extension of centrex services
US5422941A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1993 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | May 21, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13547
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A switching office translates a dialed extension number consisting of fewer digits than the minimum number normally required to identify a destination station into a Centrex number of at least the minimum number of digits. At least for those extension numbers identifying lines connected to a different switching office, the Centrex number triggers a query and response procedure to access data stored in a database in a central control. The accessed data is used to translate the Centrex number into an actual destination number uniquely identifying a particular communication line. The central control returns the destination number to the switching office for use in providing a requested communication service. Call processing methods and communication systems using these translations can extend a number of Centrex features, such as extension number dialing and extension number based call transfer, to a business subscriber's various premises served by different end offices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.