INTERNATIONAL TELECOMMUNICATION UNION)45G134 $ TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G04!2)b) a rational relationship should be established between the tariffs applicable to different classes of bitrates, with special attention to:- the structure of the costs incurred,- the capacity placed at the customers disposal,- service quality parameters;c) Administrations may adopt different tariff structures to take into account both the different media and/orfacilities used, and the varying costs of national and/or local extensions which may be needed to providethe service.