There are all kinds of systems. The main thing about the dedicated systems where the parameters can be set manually by technicians is that you can set priorities. For instance, when you say that there are conference interpreters involved, you can set audio as a priority, and lip synchronicity, for instance, and you can set them to not be quite as precise when it comes to the rendering of the background. I'm not a sound engineer or an IT person, but I know that they have all sorts of settings available.
You're always as good as the connection is. There are limits, of course, to what these systems can do. When you're sitting in a hut in the middle of nowhere, obviously your connection won't be as high performance as others.
I'm sorry if I went over the time.