Section: 20.3 Network based solution 20.3.1 General
Content: In this solution the MSC Server enhanced for ICS performs a special IMS registration on behalf of the UE. Thus, the MSC Server enhanced for ICS shall use a Private User Identity and Temporary Public User Identity that are different to those defined in clause 13 (see 3GPP TS 23.292[ IP Multimedia Subsystem (IMS) centralized services; Stage 2 ]  [70], clause 4.6.2 for more information). Furthermore, the MSC Server enhanced for ICS derives a Conference Factory URI that is known to the home IMS. These are defined in the following clauses.