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SIP Signaling and Session Control: Upgrading the NGN to Support Multimedia Services

The current voice-centric NGN architecture has no core-signaling infrastructure, which greatly limits expansion capabilities. NGN expansion without a core signaling infrastructure causes scalability and availability issues, increases routing and service complexity, increases IOT and operations costs, limits vendor choice, cannot support multimedia services and does not interwork with or provide a feasible evolution path to future IMS technologies. With a capable SIP signaling and control layer, session-related tasks are migrated from the edge NGN nodes to a centralized core session framework, resulting in an NGN architecture able to meet the increasing demand for VoIP, as well as multimedia services.

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