Problem description
Bring your own number (BYON) service aims to provide consumers with the ability to use their phone number (MSISDN) for outgoing and incoming calls from non-SIM card or non-cellular devices. Any web-based application can integrate this BYON as a feature utilizing well-known HTTP and webRTC technologies.To access the service, users are required to authenticate using their digital credentials associated with their Internet Service Provider account, for example their operator app credentials. Registration from a web endpoint is necessary to enable the service on these devices.
The regulator entities in many countries requires that for any voice call service, the emergency call service must be available, which implies knowing the location of the user who is making a call.
Knowing the service provided and the regulation of emergency calls. The problem is as follows. A user links his device (Tablet, XR glasses...) with his phone number thanks to BYON. the user may leave their phone (containing the SIM) at home and goes away with the BYON device (e.g. tablet. No SIM). If this user makes an emergency call, there migh be issues to know their location.
It is necessary to find a solution to locate the above-mentioned devices. This document aims to solve Issue#25 of the WebRTC CAMARA Group
Scenarios.
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)