isanel Sorry for late answering, but I've been busy.
I couldn't find any repo with web conferencing for elastix 4.0, I'm sorry. Btw, I'm trying to finish downloading all repos from 1.0, 2.X, 3.0 and 4.0, so you can ask for any module you need from those versions.
In addition, some of the 2.5 modules work perfectly in 4.0 as I've been testing them at work. I will try to put a download link for those repos ASAP.
Best regards.