Section: 5.5.3.6 IMS Interconnection
Content: IMS Interconnection may include the following scenarios - Interworking between several IMS-based networks - Interworking between IMS-based networks and N/ISDN - Interworking between IMS-based networks and TISPAN NGN supporting N/ISDN Emulation - Interworking between IMS-based networks and non-IMS-based networks - IMS transit scenarios in multi operator environments where one or more transit operators are between the originating and terminating operator. For IMS transit scenarios, all involved transit operators get captured in the signalling, as described in clause 5.3.4.3. Depending on the operator specific policy, IMS transit charging may be limited to the immediately adjacent transit operators only, or consider all involved transit carriers within the multi-operator environment. IMS Interconnection charging is described in TS 32.260[ Telecommunication management;Charging management;IP Multimedia Subsystem (IMS) charging ]  [20].