There are also several key changes to conventional volleyball match protocol, with team handshakes, the exchange of gifts and switching court sides at the end of sets eliminated to minimise close contact between teams. There will also be no line judges for matches, and the video challenge system will be used instead.

ที่มา https://en.volleyballworld.com/volleyball/competitions/vnl-2021/news/vnl-2021-life-in-the-bubble