UC telecom has requirement to allow customer to upgrade or downgrade from their existing plan...

Change of Plan preserves the customer ' s service relationship while moving between eligible source and target offers. The feature supports service continuity, retains traceability of subscription or asset changes, and can transform customers into or out of bundled multi-play offers as commercial plans evolve. These behaviors are central to upgrades and downgrades that should not be modeled as a complete disconnect and repurchase. In a Communications Cloud implementation, this pattern provides the cleanest balance of reuse, governance, and runtime efficiency. The feature does not make every price book universally selectable; eligibility and supported plan relationships still control the valid target offers. Digital-channel exposure is secondary to the core lifecycle behavior. The alternative designs either introduce unnecessary coupling, fail to preserve the required lifecycle state, or move standard platform behavior into bespoke code. Keeping the solution within the documented product, pricing, migration, or orchestration framework also gives operations teams clearer monitoring and recovery paths. For production readiness, the configuration should be exercised with realistic data volumes and representative MACD scenarios so that the behavior remains correct after the initial sale and throughout subsequent service changes.

Study Guide Reference:Change of Plan; service continuity; subscription traceability; multi-play transformation.