(WITHDRAWN) Validation Procedures for the International Telecommunications Charge Card Service - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile Service (Study Group I) 9 pp
The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to