vGPRS: a mechanism for voice over GPRS
Wireless Networks
Interworking internet telephony and wireless telecommunications networks
ACM SIGCOMM Computer Communication Review - Special issue on wireless extensions to the internet
Eliminating tromboning mobile call setup for international roaming users
IEEE Transactions on Wireless Communications
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When a GSM user travels to a foreign country, it is anticipated that a call delivery from a caller in that country to the GSM roamer should be a local phone call. Unfortunately, under the current GSM implementation, the call delivery results in two international calls! In this article we explain why current GSM implementation is expensive for this kind of call delivery, and then propose four solutions to reduce the two international calls into one local phone call. Our solutions may significantly reduce the nonnecessary usage of international circuits as well as customer costs