1. In accordance with the principles established in Articles 4 and 5 of Directive 96/71/EC, during the period of posting of a worker to another Member State, the inspection of terms and conditions of employment to be complied with according to Directive 96/71/EC is the responsibility of the authorities of the host Member State in cooperation, where necessary, with those of the Member State of establishment.

2. The Member State of establishment of the service provider shall continue to monitor, control and take the necessary supervisory or enforcement measures, in accordance with its national law, practice and administrative procedures, with respect to workers posted to another Member State.

3. The Member State of establishment of the service provider shall assist the Member State to which the posting takes place to ensure compliance with the conditions applicable under Directive 96/71/EC and this Directive. That responsibility shall not in any way reduce the possibilities of the Member State to which the posting takes place to monitor, control or take any necessary supervisory or enforcement measures in accordance with this Directive and Directive 96/71/EC.

4. Where there are facts that indicate possible irregularities, a Member State shall, on its own initiative, communicate to the Member State concerned any relevant information without undue delay.