UMTS telecommunications system for enabling a mobile station to receive voice-over internet protocol calls when roaming

A telecommunication system including a mobile station, and means for a mobile station to receive voice-over Internet Protocol (VoIP) calls when it is roaming away from a home network, comprising: means for informing a serving GGSN of the International Mobile subscriber Identity (IMSI) of the called...

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Bibliographic Details
Main Authors Casati, Alessio, Palat, Sudeep Kumar, Yamini, Hatef, Yang, Jin
Format Patent
LanguageEnglish
Published 27.11.2007
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Summary:A telecommunication system including a mobile station, and means for a mobile station to receive voice-over Internet Protocol (VoIP) calls when it is roaming away from a home network, comprising: means for informing a serving GGSN of the International Mobile subscriber Identity (IMSI) of the called mobile station, and means for enabling a local VoIP control server to map a called MSISDN number to the IMSI number.