Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ITU-T OB.1226:2021
• Năm ban hành / Publication date: 2001
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: ITU Operational Bulletin
• Số trang / Page: 20
• Phạm vi áp dụng / Scope of standard: GENERAL INFORMATIONLists annexed to the ITU Operational Bulletin: Note from TSBApproval of ITU-T RecommendationsTelephone Service:Azerbaijan (Ministry of Transport, Communications and High Technologies, Baku)Iran (Islamic Republic of) (Communications Regulatory Authority (CRA), Tehran)Malta (Malta Communications Authority (MCA), Floriana)Papua New Guinea (National Information & Communications Technology Authority (NICTA), Boroko)Service RestrictionsCall-Back and alternative calling procedures (Res. 21 Rev. PP-06)AMENDMENTS TO SERVICE PUBLICATIONSList of Issuer Identifier Numbers for the International Telecommunication Charge CardMobile Network Codes (MNC) for the international identification plan for public networks andsubscriptionsList of ITU Carrier CodesList of International Signalling Point Codes (ISPC)National Numbering Plan