Y.13 Subscription to EPS Fallback Event

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

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Based on local configuration in the case of an originating or a terminating session, the P-CSCF may subscribe to the PCF for notification for the EPS Fallback event using existing procedures defined in TS 23.503 [95].

If the PCF reports that an EPS fallback occurred, based on local configuration, the P-CSCF may include this information in outgoing SIP messages towards other IMS nodes.

Annex Z (normative):
Support of IMS-based Restricted Local Operator Services (RLOS)