Allow adjusting global video/audio quality and echo cancellation

Feature request

Which Nextcloud Version are you currently using: (see administration page)
[Nextcloud Hub 10] (31.0.7)

Is your feature request related to a problem? Please describe.
We experience mediocre video and audio quality, especially with more participants (8-10), although HPB is installed and CPU, RAM and bandwidth are plenty. We experience a lot of audio feedback and hearing ones own voice through the speakers of others. Non of this happens when we use zoom.

Describe the solution you'd like
Being able to adjust video quality globally on our server (e.g. always High, regardless of who's speaking). Being able to adjust echo cancellation globally or use plugins like Krisp etc.

Describe alternatives you've considered
Right now the only solution is the mute button. For the bad video quality there is no solution.

Additional context
Since Nextcloud is self hosted, it would be great to have the ability to choose video and audio settings of ones liking! Thanks!

The issue names no files, tests, or entry points. Start by locating the call media-quality and echo-cancellation configuration in the JavaScript application, then determine whether server-wide settings are supported by the current WebRTC flow. Done means a defined global quality and echo-cancellation configuration with documented behavior and tests.