ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1267	1.V.2023	(Information received by 17 April 2023)   ISSN 1564-5223 (Online)
Place des Nations CH-1211 Genève 20 (Switzerland) Tel:            +41 22 730 5111 E-mail:       itumail@itu.int		Standardization Bureau (TSB) Tel:            +41 22 730 5211 Fax:            +41 22 730 5853 E-mail:       tsbmail@itu.int / tsbtson@itu.int	Radiocommunication Bureau (BR) Tel:            +41 22 730 5560 Fax:            +41 22 730 5785 E-mail:       brmail@itu.int

Table of Contents

GENERAL  INFORMATION

Lists annexed to the ITU Operational Bulletin: Note from TSB.... 3

Telephone Service:

Armenia (Ministry of High-Tech Industry, Yerevan)

Denmark (Agency for Data Supply and Infrastructure, Copenhagen)

Service Restrictions. 20

Call-Back and alternative calling procedures (Res. 21 Rev. PP-06) 20

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Issuer Identifier Numbers for the International Telecommunication Charge Card

List of ITU Carrier Codes

List of International Signalling Point Codes (ISPC)

National Numbering Plan