The Swiss Telecommunications Act obliges telephone companies to maintain the numbers of their customers in a public directory. The information in these public directories may be obtained by authorized parties under Art. 21 of the Telecommunications Act in order to generate address directories.
The telephone companies may also request a third party - known as a data agent - to maintain the public directory. Only the telephone company or the data agent are authorized to make changes to the listings in the public directory at the request of the customer.

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