General Charging and Accounting Principles for Supplementary Services Associated with International Telecommunication Services Provided over the Integrated Services Digital Network (ISDN) - Charging and Accounting in International Telecommunication Servic
The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITü). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view t