2. Each Member State shall designate or establish one single point of contact to exercise a liaison function for the purpose of ensuring cross-border cooperation with the single points of contact of other Member States and the Critical Entities Resilience Group referred to in Article 19 (‘single point of contact’). Where relevant, a Member State shall designate its single point of contact within a competent authority. Where relevant, a Member State may provide that its single point of contact also exercise a liaison function with the Commission and ensure cooperation with third countries.