This document defines the stage-2 service description for the IP Multimedia Core Network Subsystem (IMS), which
includes the elements necessary to support IP Multimedia (IM) services.
for V14, V15:
Modification on PS Data Off support in IMS Client
Improvements to Annex M to reflect 5GS
| Improvements to Annex Y
| Clarification on UE behavior when receiving single list of Exempt Services
| Support for identity attestation and verification