The types of tariff consist of the local pulse tariff, the Long distance direct dialing (SUJ) pulse tariff, International Direct Dialing (SLI) tariff and air time for mobile telephone connection services. Article 28 The formula referred to in this provision is a calculation guide to determine the amount of the tariff. The tariff formula consists of an initial tariff formula and a tariff modification formula. In fixing the initial tariff formula, the cost component must be considered, whereas to fix the tariff level modification formula, among others, the inflation factor, the ability to pay of the public, and the continuity of telecommunications development shall be taken into account. Article 29 Paragraph (1) The prohibition for special telecommunications operations to be connected to other telecommunications operator networks is intended to provide legal certainty for the scope of special telecommunications operations which indeed is only for own use. Paragraph (2) Self-explanatory. Article 30 Paragraph (1) This provision is intended to overcome problems in the need for telecommunications services in a certain area which because of certain conditions cannot yet be reached by telecommunications services. Therefore, this Law deems it necessary to enable the special telecommunications operator who is actually only operating for his own interest, to provide telecommunications services to the public residing in such area.