scope:

This Recommendation describes a framework for NGN support of multicast-based services. It provides a general description of NGN multicast capabilities and the functional requirements for each functional group of the NGN architecture (i.e., transport stratum functions, service stratum functions, end-user functions and management functions).

Specific multicast-based services, as well as the actual implementation of NGN multicast capabilities for different network technologies, are out of scope of this Recommendation.