General Charging and Accounting Principles for International Telecommunication Services Provided over the Integrated Services Digital Network (ISDN) - Charging and Accounting in International Telecommunication Services (Study Group 3) 7 pp
The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view t