Article 171 : Rates are freely fixed by the operators and service providers in compliance with the principles of transparency, objectivity and non discrimination, except for case of duly justified overload. The operators and service providers are entitled to the disposal of the users of their tariffs. They shall ARTCI, which carries out periodically the monitoring of their effective application and the observance of the regulation. Telephone operators and services providers are included in the distribution of consumers for free, after each communication, the cost of communication completed and the remaining credit. Article 172 : The ARTCI can decide on the tariffs of an operator or service provider absence or insufficiency of competitive offers services and their reference cost. The purpose of the framing of the tariffs is: - to the tariffs towards the cost; to separate services between different services. The ARTCI can give up to a frame when the service is marketed is not significant account the needs of the public or when its opportunities for development are not clearly identified, in during the launching phases of a new service. The framing is submitted to a reasoned decision of the ARTCI, made after an investigation on the competitive position of the service (s) in question and the evaluation of the costs. This decision is notified to the operator or service provider concerned. It is enforceable within maximum two months as from its notification. Page 47 Article 173 : The ARTCI evaluates the reference cost of the services or sets of services to be framed on the basis: - the information provided by the operators and service providers constitution of the cost of these services; comparative or comparatively comparative countries.