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The user makes a call from a device using BYN. The user is connected to the Wifi network at home. The operator can usually determine the connection originated from the home connection point.
The subscriber's address is known.
3. User calls from BYON device connected to a different wifi than home wifi (eg. starbucks)
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This case is the most difficult to solve
Since the user's device could be mobile, to differentiate between scenarios 2 and 3, we need the user to confirm whether they are at their registered emergency address. If they are, PSAP routing will be based on that address. If they are not, the emergency call will be routed to the national emergency center. Note: The logic for confirming the registered address could potentially be used when the user is on a cellular network and the BYON App/Service does not have access to the device's location using the cellular network.
4. User calls from BYON device (Mobile phone) that can provide device location (and user has provided permission to fetch location)
In this scenario, the user is utilizing the BYON service on a device (mobile phone) that allows the BYON app to access the device's location. If the user has granted location access permission, the emergency call will be placed with the device's location, and PSAP routing will be based on both the device location and the registered emergency address. If the device does not support location access or if the user has not granted permission, it will revert to scenario 2 or 3.