1. A service zone is the spot on the court in which the player tries to serve the ball, i.e., 9 m wide area between each end line.
2. A substitution zone is an area between the attack lines and the center lines along the sideline where substitutes remain to enter into the game.
3. An attack line separates each side of the court into a front zone and a back zone. The line is parallel to the net and 10 ft from the centre line.
4. Substitutions may be called only in between points or at the beginning of a set and may not be called during a point or after the referee has authorized a service.