Feature Description
The Emergency Services Fallback feature allows the UE to reconnect to EUTRAN either through 5GC (4G radio, 5G core) or EPC (4G radio, 4G core). The fallback occurs when the 5G radio does not support the NR. Depending on the network capabilities, the UE selects 5GC or EPC. If the 5G core is unable to support emergency services, the UE falls back on 4G radio on the 4G core.
AMF supports UE Context Transfer messages for subscribers that are registered for emergency services or nonemergency services with emergency PDU sessions.