Setting up a TURN server is not that hard.
I used most of this guide: https://blog.netways.de/2017/08/16/setting-up-a-turn-server-for-nextcloud-video-calls/
Also the turnserver.conf from Coturn is well documented.
I’am running my testsystem (13RC2) on a modified NextcloudPI including Coturn, and it works great.
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