Femtocell service to launch in Japan January 2009. Why IMS?

Softbank Logo Softbank Japan announced this week that it plans to launch a femtocell product in January 2009 and has awarded a supply contract to NEC. Unlike mainstream femtocell developments, this uses a different network architecture with calls made and received using the SIP internet protocol which is commonly used to handle Voice over IP (VoIP) calls rather than the existing mobile network core networks via the Iu interface. Why the different approach?

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