vGPRS: a mechanism for voice over GPRS
Wireless Networks
IPv6-GSM: an IPv6-based solution for GSM number portability
International Journal of Network Management
Interworking internet telephony and wireless telecommunications networks
ACM SIGCOMM Computer Communication Review - Special issue on wireless extensions to the internet
Voice communication over GGSN/SGSN
ICACT'09 Proceedings of the 11th international conference on Advanced Communication Technology - Volume 1
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This article proposes iGSM: a voice-over-IP value-added service for the mobile network. The iGSM service provides user mobility to subscribers, which allows them to use either GSM handsets or H.323 terminals (IP phones or PCs) to access telecommunications services. We describe how the iGSM registration, deregistration, and call delivery procedures can be implemented without modifying the GSM network. We study how the tromboning effect in the standard GSM system can be avoided when accessing the IP network. Then we investigate the misrouting problem caused by user mobility