What protocol is used for multipoint video conference on LAN, which has the fastest transmission speed and the highest quality?

Now the mainstream protocol in the market is H323. In fact, this agreement has little to do with the fluency of your video conference. This protocol only represents the quality of video and the occupation of bandwidth. It is a video coding compression technology. Generally, it is no problem to transmit data in a local area network. What kind of coding is actually not that important. Using self-built or rented video conferencing system, video conferencing in local area network can be realized.