Commentaries: Art. 21

The telephone service providers shall collect and update the directory data of their customers. In doing so, the following applies:
1. The telephone service providers are not required to check the accuracy of the data.
2. They must ensure that the data corresponds to the information provided by the customers.
3. They may refuse to include information in the directory data that is obviously incorrect or that serves an unlawful purpose; they may remove such information from the directory data.
They shall allow other providers of telecommunications services or of services which are based on directory data to access the minimum content of the directory data pertaining to their customers; they shall make the data electronically accessible to them.
They shall grant access to the data in a transparent and non-discriminatory manner at prices based on the costs of providing the directory data. In doing so, they shall take account of international technical standards. In the event of any dispute, Articles 11a and 11b apply by analogy.
The providers of services based on the directory data must safeguard the integrity of the data. They may only modify the data with the consent of the telephone service provider responsible for collecting the data. They must modify or delete the data according to the changes sent by the telephone service providers. The Federal Council may issue regulations on the processing of directory data.
The telephone service providers may delegate the fulfilment of their obligations to third parties.
The Federal Council may extend the application of the provisions of this Article to other telecommunications services that are publicly accessible and widely used.