W.2 Architecture

23.2283GPPIP Multimedia Subsystem (IMS)Release 18Stage 2TS

W.2.1 EPS

The architecture to support IMS services for roaming users, including Voice over IMS, in deployments without IMS-level roaming interfaces is shown in figure W.2-1

The following architecture requirements apply:

– P-CSCF (at HPLMN) identifies the serving network (VPLMN) where the UE is located using the procedure defined in clause W.3.

Figure W.2-1: architecture IMS architecture

W.2.2 5GS

See clause Y.9.2.