1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 General principles of the NGN functional architecture
6.1 General characteristics
6.2 Connectivity to the NGN
7 Overview of the NGN architecture
7.1 Transport stratum functions
7.2 Service stratum functions
7.3 End-user functions
7.4 Management functions
7.5 Identity management (IdM) functions
8 NGN concepts
8.1 Mobility levels in the NGN architecture
8.2 NGN service architecture
8.3 Network topology hiding functions and NAPT traversal functions
8.4 Overload control
8.5 Charging and accounting functions (CAF)
9 Generalized NGN functional architecture
9.1 NGN functional architecture framework
9.2 NGN functional entities (FEs)
9.3 Functional entity descriptions
9.4 Reference points
10 NGN components
10.1 NGN service-specific components
10.2 NGN transport-specific components
10.3 Management functions
11 Security considerations
Annex A – Differences between this edition and the 2006 edition of
Recommendation ITU‑T Y.2012
Annex B – Support of IPTV services
B.1 Overall functional mapping between NGN-based IPTV and NGN
architectures
B.2 IMS-based IPTV functional architecture
B.3 Non-IMS-based IPTV architecture
Appendix I – Examples of NGN network configurations
I.1 Configurations and topology of the NGN
I.2 Relationship between the NGN and administrative
domains
I.3 Relationship between the NGN and service domains
I.4 Enterprise role model
I.5 Functional roles
Appendix II – Transport-stratum access network scenarios
II.1 Introduction
II.2 Scenario 1: Multi-layered transport stratum
II.3 Scenario 2: Access aggregation using layer-2
II.4 Scenario 3: Access aggregation using layer-3
II.5 Scenario 4: Multistage policy enforcement
II.6 Scenario 5: Partitioning into transport-layer traffic
subdomains
Appendix III – Instantiation of NGN reference points
III.1 Introduction
III.2 Scope
III.3 Rationale to consider SNI
III.4 Instantiation of NGN reference points
Appendix IV – Example illustrative deployment scenario for IdM in NGN
Bibliography