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1.User calls from BYON device connected to cellular network
In this mobile connection scenario, it is necessary to know the UPF node to which the user is connecting from his mobile network. The UPF is the element responsible for providing the internet gateway to operator's customers.
In the 5G standard architectures the Access and Mobility Management function (AMF) is the element in charge of managing the UE mobility within the different gNodeBs of the operator. This information of the radio cell a user is connected to, is sent to the UDM throughout the N8 interface as outlined in the 3GPP standard. However, this information is also needed by the SMF to determine the best UPF the user can connect to, this is done through the N11 interface.
2. User calls from the BYON device connected to his home wifi
- **conoce la direccion de abonado**
3. User calls from BYON device connected to a different wifi than home wif (eg. starbucks)