@girish@nebulon Encountering the exact same issue with Matrix with the same network setup and same individual I was testing Nextcloud Talk with. Any ideas on how I can proceed here? I'm a bit lost but it looks to be either a TURN or network issue. The only thing I've changed lately is bridging my ISP modem to a new router I got. I have forwarded the ports I believe I need. (Also I sent new screenshots to the support email)
Thanks for your coturn write up. We did refer to that when we added turn support in Cloudron 5.1, in fact.
On how to update: you can just uninstall turn server (and also free up the turn ports on the host). The turn server is exposed at my.domain.com, so no need to setup an extra A record. The nextcloud talk app is pre-configured to use the integrated turn server. You can just "re-configure" the app (for example, just go to Location and click save without making any changes) and it should overwrite your old turn settings and put the new one.