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High-speed switching, QoS provisioning, security, and mobility are main challenges faced with existing networks and to be confronted by NGN researchers and developers. This paper promotes a BSF-OES strategy (Backbone Substrate First, Outwards Expansion Second) towards NGN with a redefined out-of-band concept. In other words, we shall first focus on the backbone subnetwork with an emphasis on building a highly efficient, high-speed switching substrate with embedded QoS and Security mechanisms. An "outwards expansion"from the backbone can take place only when further simplification and refinement to control and management platforms are ready for migration. As an example of the first stage development, a framework of SUPA and its key switching technique called EPFTS are presented and smooth migration issues from Internet to SUPANET are also briefly discussed.