regard must be paid to the supply of and demand for the numbering resources put to tender, the level of development of the market to which the numbering resources being put to tender relate, and the level of such fees in other Member States. It may in no case be so high as to hinder the development of innovative services and competition in the market. Article 75 (European telephone access codes) (1) The international prefix for calls abroad from the Republic of Slovenia shall be 00. Undertakings shall inform their end-users of this in a suitable manner. (2) A provider of publicly available telephone services that enables international calls must handle calls to or from the European Telephony Numbering Space at prices that are similar to the prices for calls to or from other Member States. Article 76 (access to services using non-geographic numbers) (1) The operator of a public communications network or provider of publicly available electronic communications services must enable end-users to call all numbers provided within the EU, including numbers from the European Telephony Numbering Space and single international freephone numbers, and to access and use services using non-geographic numbers within the EU, when this is technically and economically feasible. (2) An operator of public communications networks or a provider of publicly available electronic communications services shall not be liable to meet the obligation referred to in the preceding paragraph if a called subscriber has chosen, for commercial reasons, to limit calls originating from a specific area of the European Union. (3) A court may order an operator of public communications networks or a provider of publicly available electronic communications services to block access to individual numbers or to services accessible via these numbers if the grounds exist for doing so on account of abuse or fraud in a specific case with which it is dealing. The court may, in such a case, require that a provider of electronic communications services retain revenue from the connection concerned or another service. Article 77 (ENUM numbers) (1) The Agency shall convert numbers into ENUM numbers. (2) The Agency shall, by means of a general act, regulate in greater detail the method of converting numbers into ENUM numbers and the method of database management, as well as set technical and other requirements relating to the conversion of numbers and necessary for implementation of this Article. Article 78 (supervision) The Agency shall oversee the implementation of the provisions of this Chapter and of the decisions issued pursuant thereto. VII. SECURITY OF NETWORKS AND SERVICES, AND OPERATION IN EMERGENCY SITUATIONS