ITU Operational Bulletin 1f8a81b9b0707b63-19211.webchannel-proxy.scarabresearch.com/itu-t/bulletin
No. 1267	1.V.2023	(Information received by 17 April 2023) ��ISSN 1564-5223 (Online)
Place des Nations CH-1211 Gen�ve 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