variations of Bluetooth multipoint

• "simple multipoint" — automatic switching, but doesn't allow for pausing an ongoing call when another comes in
• "advanced multipoint" — like simple multipoint, but also allows for pausing an ongoing call when another comes in
• Bluetooth 5.2, which allows for one receiver for multiple sources (which I think is the same as "Auracast"?)
• Note — some products claim multipoint capability (or at least hint at it), but implement a proprietary clunky version of it