(FIVB Casebook 1.03)
20.1.1 Participants must know the “Official Volleyball Rules” and abide by them.
20.1.2 Participants must accept referees’ decisions with sportsmanlike conduct, without disputing them.
In case of doubt, clarification may be requested only through the game captain.
20.1.3 Participants must refrain from actions or attitudes aimed at influencing the decisions of the referees or covering up faults committed by their team.
20.2.1 Participants must behave respectfully and courteously in the spirit of FAIR PLAY, not only towards the referees, but also towards other officials, the opponents, team-mates, and spectators.
20.2.2 Communication between team members during the match is permitted (Rule 5.2.3.4).