Telecom providers are modernizing legacy OSS/BSS systems to support 5G and digital services, but face challenges from high costs, siloed architectures, and unscalable APIs. The TM Forum’s Open Digital Architecture (ODA) and Open APIs offer a blueprint, but lack implementation guidance. This paper advocates for API-led connectivity, using layered APIs—system, process, and experience—to drive agility, reuse, and independence across teams. A case study on Mythical Telecom shows how decomposing APIs avoids technical debt, accelerates CRM migration, and improves delivery speed. A unified API strategy boosts flexibility, governance, and innovation.

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