REDUCING THE NETWORK COST OF CALL DELIVERY TO GSM ROAMERS

When a GSM user travels to a foreign country, ii 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 implementa tion, the call delivery results in two international calls! In this ar ticle we explain why current GSM implementation is expensive for this kind of call delivery, and then propose four solutions to reduce the t wo international calls into one local phone call. Our solutions may si gnificantly reduce the nonnecessary usage of international circuits as well as customer costs.