Y.13 Subscription to EPS Fallback Event

Y.12 P-CSCF Registration in NRF

Y.11 Void

Y.8 Support for Paging policy differentiation for IMS services

Y.9 Support of IMS Services for roaming users

Y.10 Support of RAN Assisted Codec Adaptation

Y.7 Geographical Identifier

Y.6 Retrieval of Network Provided Location Information in 5GS

Y.4 IP version interworking in IMS

Y.5 Usage of NAT in 5GS