Section: 4.13.4 Emergency Services 4.13.4.1 General
Content: If the 5GS supports Emergency Services, the support is indicated to UE via the Registration Accept message on per-TA-list and per-RAT basis, as described in TS 23.501[ System architecture for the 5G System (5GS) ]  [2]. If the 5GS supports Emergency Services Fallback, the support is indicated to UE via the Registration Accept message on per-TA-list and per-RAT basis, as described in TS 23.501[ System architecture for the 5G System (5GS) ]  [2]. The UE shall follow the domain selection rules for emergency session attempts as described in TS 23.167[ IP Multimedia Subsystem (IMS) emergency sessions ]  [28]. If the 5GC has indicated Emergency Services Fallback support for the TA and RAT where the UE is currently camping and if the UE supports emergency services fallback, the UE shall initiate the Emergency Services Fallback procedure described in clause 4.13.4.2. At QoS Flow establishment request for Emergency Services, the procedure described in clause 4.13.6.2 Inter RAT Fallback in 5GC for IMS voice or the procedure described in clause 4.13.6.1 EPS fallback for IMS voice may be triggered by the network, when configured.