Not sure if this answers your specific questions - but I found an article written by a dev from Jitsi, describing the architecture of Jitsi Meet: Improving Sca

Not sure if this answers your specific questions - but I found an article written by a dev from Jitsi, describing the architecture of Jitsi Meet: Improving Scale and Media Quality with Cascading SFUs https://webrtchacks.com/sfu-cascading/ https://webrtchacks.com/sfu-cascading/ (November 2018) Edit: Based on another Jitsi dev's comment in this thread: SFU stands for "Selective Forwarding Unit", which was extracted to a standalone project, Jisti Videobridge.