1. National regulatory authorities may, in accordance with Article 68, impose obligations of transparency in relation to interconnection or access, requiring undertakings to make public specific information, such as accounting information, prices, technical specifications, network characteristics and expected developments thereof, as well as terms and conditions for supply and use, including any conditions altering access to or use of services and applications, in particular with regard to migration from legacy infrastructure, where such conditions are allowed by Member States in accordance with Union law.

2. In particular, where an undertaking has obligations of non-discrimination, national regulatory authorities may require that undertaking to publish a reference offer, which shall be sufficiently unbundled to ensure that undertakings are not required to pay for facilities which are not necessary for the service requested. That offer shall contain a description of the relevant offerings broken down into components according to market needs, and the associated terms and conditions, including prices. The national regulatory authority may, inter alia, impose changes to reference offers to give effect to obligations imposed under this Directive.

3. National regulatory authorities may specify the precise information to be made available, the level of detail required and the manner of publication.