Enhanced interworking function for interfacing digital cellular voice and fax protocols and internet protocols
US6385195B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1997 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Jul 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2207/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An enhanced interworking function (E-IWF) supports a method of direct digital interworking between a radio telecommunications network and standard Internet Protocol (IP) routers. A general purpose interworking function performs speech transcoding and data interworking. A specific translation interworking function translates directly between mobile-specific voice encoding and Voice-over-IP protocols, and between mobile-specific fax encoding and Fax-on-IP protocols. The method provides interworking between cellular protocols in a time division multiple access (TDMA) cellular telecommunications network, and Internet protocols being utilized by an Internet End-System (ES) or fax gateway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.