Having final authority over all decisions including those that don't specifically address the rules.
Having authority over other officials of volleyball and overruling other officials if certain they made an incorrect decision.
Replacing an official that isn't performing functions properly.
First referee responsibilities before the match include...
Examine the ball that will be used for the match.
Inspect the net, playing area, and other equipment to ensure they meet specifications.
Conduct the coin toss and meeting of referees and team representatives.
Control the warm up conduct of teams.
Control the warm-up conduct of teams.
Establish ground rules as needed.
Throughout the match, the first referee makes calls regarding faults and scoring issues. Following the match, the first referee notes the score and signs the official paperwork.