16 2° to make any unsolicited free of charge telephone call for the purposes of the direct marketing of goods and/or services to a user, unless that user has previously given explicit consent. Users may complain to the Regulatory Board in respect of any infringement of this Article. The Regulatory Board issues an enforcement notice requiring that any practices under this Article will cease. Article 27 Upon advice from the Regulatory Board, the Minister may, by Ministerial decree make regulations for the presentation and restriction of the identity of calling and connected telecommunications lines. Article 28 There is hereby established a fund, known as "the universal access fund". The principal objective of the fund is to facilitate the provision on affordable terms and with minimum subsidy, of the widest possible access to a public telephone service by the general public in all parts of the Republic. The President of the Republic, by Presidential decree establishes the operation of the universal access fund. The Universal Access Fund functions on contributions from Public General telecommunication operators. That contribution is determined by a Decree of the President of the Republic in a time period specified by the Board. Public operators must disclose details of their potential. Failure to provide such information is subject to the sanctions set out in Article 60 of this law. The Regulatory Board may suspend or revoke and telecommunications license (including associated radiocommunications licenses) granted to any telecommunications operator where there is persistent failure by that operator to make properly assessed payments to the fund on the due date. Failure by any public telecommunications operator to pay national telecommunication access fund contributions on the specified dates or not to pay them at all is regarded as a debt due to the Regulatory Board and is recovered by court order. CHAPTER V. TARIFFS Article 29 Suppliers of networks and telephone services in general determine and publish tariffs for the supply and use of their networks and telecommunication services. A copy of each tariff (including all changes made to these at any time) is, at the same time as these are published, provided to the Regulatory Board. Tariffs are also provided to any other natural person or organization which requests them.