"Bluetooth audio’s biggest upgrade in years is coming soon to headphones", The Verge, Jul 12, 2022
There are two — (TODO: name?) and "Auracast"
"Both TBS and MCS acknowledge the fact that there may be multiple sources of media and multiple different call applications on the Server devices. To accommodate this, both can be instantiated multiple times – once for each instance of an application. This allows a Client with the complementary profile to control each application separately. ..."