Add guest support for video/audio conferencing


it would be great to be able to invite guests for video/audio conferencing sessions. Oftentimes, one has to do a conference/call with somebody from outside of the organization who do not have an account on the Nextcloud installation. That would enable one to have a conference/call with them in their browser without installing a third party client and all the hassle that comes with that.

This could be archived by allowing the administrators to set a specific permission for certain users who should be able to conference with guests. Then the user with that permission could send/give them a time-limited access code and a link where they can enter it. Afterwards, the user gets a notification that the guest is online and they can communicate with each other.