Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ITU-T OB.1223:2021
• Năm ban hành / Publication date: 2001
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Operational Bulletin No - 1223 (1 - VII - 2021)
• Số trang / Page: 26
• Phạm vi áp dụng / Scope of standard: GENERAL INFORMATIONLists annexed to the ITU Operational Bulletin: Note from TSBApproval of ITU-T RecommendationsTelephone Service:Armenia (Ministry of High-Tech Industry, Yerevan)Cyprus (Office of the Commissioner of Electronic Communications and Postal Regulation(OCECPR), Nicosia)Morocco (Agence Nationale de Réglementation des Télécommunications (ANRT), Rabat)Other communicationAustriaService RestrictionsCall-Back and alternative calling procedures (Res. 21 Rev. PP-06)AMENDMENTS TO SERVICE PUBLICATIONSList of Issuer Identifier Numbers for the International Telecommunication Charge Card National Numbering Plan