ITU-T E.113-1993 (WITHDRAWN) Validation Procedures for the International Telecommunications Charge Card Service - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile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
ITU-T E.113-1993 history
1997ITU-T E.113-1997 Validation Procedures for the International Telecommunications Charge Card Service - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors Operation Numbering Routing and Mobile Services - International Operation - Gene
1993ITU-T E.113-1993 (WITHDRAWN) Validation Procedures for the International Telecommunications Charge Card Service - Telephone Network and ISDN; Operation, Numbering, Routing and Mobile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