Section: 4.3.1 UE's usage setting
Content: The UE's usage setting defined in 3GPP TS 24.301[ Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 ]  [15] applies to voice capable UEs in 5GS and indicates whether the UE has preference for voice services over data services or vice-versa, where: a) voice services include IMS voice; and b) data services include any kind of user data transfer without a voice media component. The UE's usage setting can be set to: a) "voice centric"; or b) "data centric". If the UE is capable of S1 mode, there is a single UE's usage setting at the UE which applies to both 5GS and EPS.