A.2 Overview
23.2793GPPCombining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) servicesRelease 17Stage 2TS
CSI interworking from CSI origination to IMS termination is required to enable communication from UE’s support CSI towards UEs supporting IMS termination. CSI interworking can be implemented in two different ways:
1) CSI interworking can also be achieved in the terminating terminal if the operator has control of the terminal. This is beyond the scope of this document.
2) CSI Interworking is detected and performed in the originating network.
3) CSI Interworking is detected and performed in the terminating network.