1. By 31 December 2020, the Commission shall, taking utmost account of the opinion of BEREC, adopt a delegated act in accordance with Article 117 supplementing this Directive by setting a single maximum Union-wide mobile voice termination rate and a single maximum Union-wide fixed voice termination rate (together referred to as 'the Union-wide voice termination rates'), which are imposed on any provider of mobile voice termination or fixed voice termination services, respectively, in any Member State.

To that end, the Commission shall:

(a) comply with the principles, criteria and parameters provided in Annex III;

(b) when setting the Union-wide voice termination rates for the first time, take into account the weighted average of efficient costs in fixed and mobile networks established in accordance with the principles provided in Annex III, applied across the Union; the Union-wide voice termination rates in the first delegated act shall not be higher than the highest rate among the rates that were in force six months before the adoption of that delegated act in all Member States, after any necessary adjustment for exceptional national circumstances;

(c) take into account the total number of end-users in each Member State, in order to ensure a proper weighting of the maximum termination rates, as well as national circumstances which result in significant differences between Member States when determining the maximum termination rates in the Union;