The service is the act of putting the ball into play by the right back line player, placed in the service zone, who hits the ball with own hand (open or closed) or any part of the arm to begin a rally. During the game the player to serve is determined. When the serving team wins the rally the same player who served before serves again. When the service team commits a fault or its opponents wins the rally, the latter must rotate and the player who moves from right forward to the right back position will serve.
Each time a player touches the ball or is touched by the ball it is considered as a contact for the team. The body including waist and above may be contacted by the ball. During the first contact of a team if the ball is not played overhand with fingers it may contact various parts of the body. The ball can rebounds in all directions, but it should be hit clearly without rest. If the contact of the ball by two opponents at the same time over the net, the ball is still in play and the receiving team can have another three contacts. If a player does not clearly contact the ball or lets it come to a momentary rest it is considered as fault.
The ball sent into the opponents' court must cross the vertical plane of the net within the crossing space. Except in service a ball sent to the opponents court may touch the net if it passes through the crossing space. A ball driven into the net may be recovered provided it does not touch the floor nor is contacted the fourth time. The team that sends the ball into the opponents' court commits a fault 'Ball out'.
The attack-hit is the action of a player to direct the ball towards the opponents court. When the ball is contacted by the blocker or crosses the vertical plane of the net then it is considered as completed. A player commits an attack-hit fault when he hits a ball within the playing space of the opposing team.
Blocking is the action allowed only to front line players (blockers) close to the net to intercept the ball coming from the opponents court. A blocker commits a fault when he blocks outside the antennas and touches the ball in the opponent's space.
These are individual actions or team movements contrary to the rules of the game and they consist of not sending the ball correctly over the net into the opponents court.
There is always a penalty to a fault. Depending upon the case penalty means that the opponent to the team committing the fault gains a point or the right to serve. If two opponents commit a fault simultaneously the penalties cancel each other and a play-over is called.