Does the Czech legislation under which judges are not entitled to remuneration for on-call duty, even though other employees (in the public and private sectors) are entitled to that remuneration on the basis of the Zákoník práce (Labour Code) or other provisions of law, constitute unequal treatment in the field of pay, prohibited by Council Directive 2000/78?

Does the Czech legislation under which all judges (according to the number of years credited) are entitled to the same salary, even though they perform different numbers of hours of on-call duty, constitute unequal treatment in the field of pay, prohibited by Council Directive 2000/78?