The following aspects of IMS Centralized Services (ICS), though studied in Release 8 (and to some extent documented in TR 23.892
), required further study and are herein documented:
ICS supplementary service data management (e.g. Supplementary Services data synchronization).
Management of Telephony Application Server (TAS) user configuration for an ICS UE when PS access cannot be used.
Consideration shall be given to attaining a consistent user experience, and managing and enforcing operator policies as well as user preferences. Heterogeneous access technologies over which the IMS service is provided shall also be taken into account.