Support Single Active Call Session per User Across Tabs with Device Switching

We need the ability to ensure that only one tab on the same device can participate in a call at any given time, while still allowing users to explicitly switch between devices (e.g., mobile app ↔ web browser).

Additional Considerations / Questions:

• Is there any session arbitration or device takeover API available?

• Can we query the number of active connections for a given UID?

• What is the recommended approach or architecture to enforce single-session calling in a multi-tab web application?