We are deprecating the SCTP Webrtc Datachannels and recommend migrating your deployment to use websockets. At some point support for SCTP will be dropped from the project.
We had migrated the default deployment from now on to use that by default for new installs ( jitsi/jitsi-meet#7781 and jitsi/jitsi-videobridge#1462). As of today(2020-09-25) this is only in unstable, but soon will be in the stable repo.
There is a document on how to do the migration here
With this change, we no longer by default use the multiplexing in nginx based on ALPN as it proved to be problematic in a few scenarios. The TURN server now just uses default ports (3478 and 5349). If someone wants to run it on port 443 as nginx on the same box we recommend using a second DNS and you can read how to do that here.