3.1 Overview3.2 Registration3.3 Mechanism to Register Multiple User Identities at a Go3.4 Session Initiation3.5 Identification3.6 IP Multimedia Services Identity Module (ISIM)3.7 Sharing a Single User Identity between Multiple Devices3.8 Discovering the IMS Entry Point3.9 S-CSCF Assignment3.10 Mechanism for Controlling Bearer Traffic3.11 Charging3.12 User Profile3.13 Service Provision3.14 Connectivity between Traditional CS Users and IMS Users3.15 IMS Transit3.16 Support for Local Dialling Plans3.17 IMS Emergency Sessions3.18 SIP Compression3.19 Combination of CS and IMS Services – Combinational Services3.20 Voice Call Continuity3.21 Security Services in the IMS3.22 Interworking between IPv4 and IPv6 in the IMS