From the Official CEV Communication :
4.7.2.1 The ranking of teams is determined by the points awarded for matches won and lost.
4.7.2.2 Points awarded per match to each team:
• Winner 3:0 or 3:1 3 points
• Winner 3:2 2 points
• Loser 2:3 1 point
• Loser 1:3 or 0:3 0 point
4.7.2.3 In case of equality in the number of points gained by two or several teams, they will be classified in
descending order by the number of matches won.
4.7.2.4 If the tie persists, as per number of matches won, they will be classified in descending order by the
set quotient resulting from the division of the number of all sets won by the number of all sets lost.
4.7.2.5 If the tie persists, as per the set quotient, they will be classified in descending order by the set points
quotient resulting from the division of all set points scored by the total of set points lost during all sets.
4.7.2.6 If the tie continues, as per the sets points quotient, the teams are ranked according to the result(s) of
the match(es) they have been disputing between them.