Technical Specifications and Technical Reports relating to the Common IP Multimedia Subsystem (IMS)

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**What the scope covers** TS 21.202 is a catalogue document that identifies 3GPP Technical Specifications and Technical Reports specifically relating to the Common IP Multimedia Subsystem (IMS) as maintained by 3GPP. It does not define procedures or interfaces itself; it serves as a curated index. The scope explicitly notes that adopting standards organizations may not require every listed specification, implying the document also functions as a scoping guide for external SDOs picking up Common IMS. **When a RAN/core engineer would open it** An engineer would consult this document primarily as a navigation aid — for example, when trying to establish which subset of 3GPP specs governs IMS functionality for a given deployment or standards-adoption exercise. It is particularly useful at the start of a project when determining the relevant specification landscape, or when responding to an external SDO inquiry about which 3GPP documents constitute the Common IMS baseline. It has no direct operational or protocol-debugging value; once the relevant specs are identified, the engineer moves to those individual documents.

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