Zero-Downtime Deployments in Telecom: How to Release Changes Without Disrupting Services
Telecom software cannot always be deployed the same way as a conventional web application. A typical application deployment might involve stopping an old version, starting a new version, running a few
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Ahmet Özel
AI Engineer. Computer Vision, RAG and LLM agents.
Keeping the previous environment available is only part of a working rollback. Once version 2 writes a new subscriber state or event value, version 1 must still interpret it correctly after traffic moves back. Adding an optional field can be structurally compatible while changing its meaning breaks old behavior.
I would test a small coexistence matrix: each version writes, both versions read, and a workflow started by one version resumes under the other. Retained provisioning events belong in that test too, since they can outlive the rollout window. That gives the expand-and-contract plan a behavioral acceptance check before removing the old representation.