Specific Tariff and Accounting Principles Applicable to ISDN Supplementary Services - Series D: General Tariff Principles General Tariff Principles - Charging and Accounting Principles for International Telecommunication Services Provided over the ISDN St
General charging and accounting principles for ISDN supplementary services may be found in Recommendation D.230. This Recommendation indicates the application of the general principles to each ISDN supplementary service. The supplementary services are placed in logical groupings where they share similar considerations and charging principles. Annex A summarizes the charging mechanisms and support requirements.