scope:

The present document elaborates on RD system architecture and assigns and describes internal interfaces to specific services and functional entities on the CSP side. It provides guidance on implementation issues that CSPs have to deal with.

The present document contains:

• A reference model in the network operator and communication service provider domain.

• A high level description of Internal Network Functions and Interfaces.

• Application of the reference model to some typical CSPs.

It does not intend to replace any existing document which specifies network operator and communication service provider's architecture and internal network interfaces. The present document does not override or supersede any specifications or requirements for the Retained Data. In particular, it does not override any clauses in TS 102 656 [i.2] and TS 102 657 [i.3].