(2) Telecommunications operators are obligated to provide compensation referred to in paragraph (1), unless the telecommunications operator can prove that the loss was not caused by its mistake and/or negligence. (3) Provisions concerning the procedure for filing and settlement of compensation referred to in paragraph (1) and paragraph (2) shall be regulated by Government Regulation. Article 16 (1) Every telecommunications network operator and/or telecommunications service operator is obliged to provide a contribution to universal services. (2) The universal services contribution referred to in paragraph (1) shall be in the form of provision of telecommunications facilities and infrastructure and/or other compensation. (3) Provisions on universal service contribution referred to in paragraph (2) shall be regulated by Government Regulation. Article 17 The telecommunications network operator and/or telecommunications service operator is obligated to provide telecommunications services based on the following principles: a. equal treatment and the best service for all users; b. increase of efficiency in telecommunications operations; and c. fulfilling the standards of service as well as the standards of providing facilities and infrastructure. Article 18 (1) The telecommunications services operator is obligated to note/record in detail the use of telecommunications services by telecommunications users. (2) If the user requires the notes/records of the use of telecommunications services referred to in paragraph (1), the telecommunications operator is obligated to provide these. (3) Provisions on noting/recording the use of telecommunications services referred to in paragraph (1) shall be regulated by Government Regulation.