Having a USSD Gateway (USSD Gw) with SIP capabilities is a crucial step in preparing for USSI (USSD over IMS) as outlined in 3GPP TS 23.490.

This integration ensures interoperability between legacy USSD services—traditionally reliant on SS7/MAP—and IMS-based networks where SIP is the primary signaling protocol. As operators transition to VoLTE and 5G, maintaining USSD functionality without circuit-switched fallback becomes essential.

By supporting SIP, the PAiC BD USSD Gw can act as a protocol bridge, enabling existing USSD applications to function within IMS architectures. This not only preserves key services but also ensures a smooth evolution towards all-IP networks without disrupting user experience.

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