ENHANCED INTERWORKING FUNCTION FOR INTERFACING DIGITAL CELLULAR VOICE AND FAX PROTOCOLS AND INTERNET PROTOCOLS

摘要

An enhanced interworking function (E-IWF) (14) supports a method of directdigital interworking between a radio telecommunicationsnetwork (15-18) and standard Internet Protocol (IP) routers (12-13). A generalpurpose interworking function performs speech transcodingand data interworking. A specific translation interworking function translatesdirectly between mobile-specific voice incoding (24) andVoice-over-IP protocols (23), and between mobile-specific fax encoding (62)and Fax-on-IP protocols (71). The method providesinterworking between cellular protocols in a time division multiple access(TDMA) cellular telecommunications network, and Internetprotocols being utilized by an Internet End-System (ES) (31) or fax gateway(49).