This Recommendation describes the overall signalling architecture for IPTV control plane. It identifies the functions, functional blocks, physical entities, interfaces, and protocols that will model the control plane for IPTV.

The interfaces identified in this Recommendation include:

• interfaces between the service control entities and the IPTV application entities;

• interfaces between the service control entities and the control entities of service transport stratum;

• interfaces between the service control entities and the content delivery entities;

• interfaces between the service control entities and the end user.

Other interfaces (such as the interfaces between two IPTV application entities, internal interfaces of service transport stratum, etc.) are outside the scope of this Recommendation.

Appendix I provides functions and reference architecture of non-NGN IPTV architecture which are extracted from [ITU-T Y.1910]. This includes the reference points related and unrelated to service control functions, which may be helpful for the readers.