Finally! Safari and SFU became good fellows.
Eyeson is based on this great approach of [Single-Stream-Technology][single-stream]. All participants are basically merged into one audio/video stream that opens a great window of advantages. This technique is called MCU ("Multipoint Control Unit").
Some time ago, Eyeson introduced a new mode called SFU ("Selective Forwarding Unit") to directly send your audio/video stream to your video call participant and vice versa.
This mode is only activated when 2 people have a video call. As soon as a 3rd participant joins, Eyeson switches from SFU to MCU mode in order to maintain quality improvements.