This guide explains why Metaswitch Perimeta SBC customers should reassess their SBC strategy after Microsoft’s 2024 decision to sunset Metaswitch products and sell Perimeta to Alianza, whose SaaS-only, cloud-delivered model may reduce the deployment and licensing flexibility many Tier 2–3 service providers rely on (page 2). It outlines four key risks of “standing still”: losing control over on-prem or hybrid deployment choices, falling behind on security patches and regulatory compliance as threats evolve, unclear vendor commitment and roadmap transparency for IMS and interconnect needs, and insufficient scalability to support IMS, VoLTE, 5G, and future network growth (pages 3–4). It provides a migration readiness checklist (page 5), best practices like interoperability testing and alignin

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