Section: 5.2.2.4.2 Namf_MT_EnableUEReachability service operation
Content: Service operation name: Namf_MT_EnableUEReachability. Description: The consumer NF uses this service operation to request enabling UE reachability. Inputs, Required: NF ID, UE ID. Inputs, Optional: Extended Buffering Support, PPI, ARP, 5QI, QFI, PDU Session ID. Outputs, Required: Result indication. Outputs, Optional: Redirection information, Estimated Maximum wait time. See clause 4.13.3.6 and clause 4.24.2 for details on the usage of this service operation. The consumer NF does not need to know UE state. The AMF accepts the request and respond the consumer NF immediately if UE is in CM-CONNECTED state. If the UE is in CM-IDLE state, the AMF may page the UE and respond to the consumer NF after the UE enters CM-CONNECTED state. If the result of the service operation fails, the AMF shall set the corresponding cause value in the result indication which can be used by the NF consumer for further action. If the related UE is not served by the AMF and the AMF knows which AMF is serving the UE, the AMF provides redirection information which can be used by the NF consumer to resend UE related message to the AMF that serves the UE.