Talk questions on video and rightsmanagement


I have installed Talk on NC 16, the chat is working and phone too.

I tried it some while ago and remember that I need to install “something extra” (stun?) for videophoning where can i find this, I cannot find it anymore.

After installing the “Nextcloud Talk” on the smartphones, I see all groups and users on this instance. Is there some way to limit what users see and can send messages to?