C.1 General

23.2373GPPIP Multimedia Subsystem (IMS) Service ContinuityRelease 17Stage 2TS

This annex provides implementation guidelines for the deployment of ATCF in architectures without IMS-level roaming agreement, and where the P-CSCF and ATCF are located in the HPLMN and MSC is in the VPLMN. Support for architectures without IMS-level roaming interfaces is optional.