Call Flows This section describes the key call flows of Combined UPF Selection for cnSGW-C and SMF feature. Initial Attach on 4G for 5G Capable Device Call FlowUPF Registration with User Plane ID Call FlowInter-SGW Handover on 4G RAT for 5G Capable Devices Call Flow5G to EPS Handover Using N26 Interface – cnSGW-C and SMF Separate Node Call FlowWi-Fi to LTE Handover Call Flow