This TS specifies the stage 3 of the Ud
interface between the Front-Ends (FEs) and the User Data
Repository (UDR) in the User Data Convergence (UDC architecture).
It specifies the protocol and interactions between the FE and the UDR for Ud
reference point, in particular:
The details of the LDAP protocol that are to be considered
The details of the SOAP envelope that provide support for subscriptions to notifications and notifications about
data changes service (S/N operations).
The User Data Convergence Stage 2 description (architecture and information flows) is specified in TS 23.335
The UDR data model used with LDAP (i.e. attributes, object classes and directory information tree) is implementation
specific and is left outside the scope of 3GPP specifications. For multivendor interoperability between FEs and UDR
specific integration projects are needed. Some examples of Ud
data models are described in TR 29.935