This Recommendation gives a description of NGN capability set 2 in terms of the overall requirements and a high-level overview of the functional features that are supported. This Recommendation also lists ITU-T Recommendations relevant to NGN capability set 2. To fulfill the general objectives and principles of the NGN identified in [ITU-T Y.2001] and [ITUT Y.2011]@ the present Recommendation focuses on key capabilities whilst ensuring that the general and long-term architectural direction of the NGN is maintained to be as flexible as possible to allow future enhancements.