If those you wish to have a video call with already have each others phone numbers then Signal is a option. It supports up to 40 participants. Available on Android, iPhone, Windows, Mac and Linux.
Signal has other great chat/messaging features too.
Also a unofficial community on Kbin
So i just checked in on Desktop Beta 117 and noticed that CBR is available in settings so i started to wonder if anyone has any clue if there are plans to implement this on the iPhone/iPad app?