Page 30 rantee, within the framework of their co-operation, the confidentiality of the correspondences in compliance with the Community regulations. Title VI: APPROVAL OF EQUIPMENT AND AUTHORIZATION OF INSTALLERS Chapter I: Conditions for the start of the phase of equipment Article 88 : The equipment intended to be connected to a Telecommunications / ICT network open to the public and radio equipment must be subjected to an assessment of their conformity to the essential requirements by the ARTCI. The equipment which meet the requirements are approved by the ARTCI. The approval is materialized by a certificate established by the ARTCI. The evaluation of conformity is subject to the payment of a duty to the ARTCI. The amount and methods of calculating the burden of and the Minister in Charge of Telecommunications / ICT. Article 89 : The ARTCI can entrust independent national or foreign standardization institutions to design technical standards for the approval of equipments. The technical standards adopted by the ARTCI are published in the Gazette of the Republic of Côte d'Ivoire, after their approval by a Ministerial Order of the Minister in Charge of Telecommunications / ICT. Article 90 : A decree sets the content and conditions of issue of the approval certificate of the radio to be connected to a Telecommunications / ICT network open to the public. Chapter II: Evaluation Procedures Article 91 : The ARTCI determines the procedures for the assessment of compliance essential requirements. These procedures correspond to those which are used on the international level for equipment of the same standard and category. The evaluation procedures adopted by the ARTCI are submitted to the Minister in charge of Telecommunications / ICT for approval. Article 92 : The laboratory tests and the organizations to which the people responsible for the start of the sales phase of Telecommunications / ICT in order to establish their compliance with the