ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1273	1.VIII.2023	(Information received by 14 July 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

Approval of ITU-T Recommendations

Assignment of Signalling Area/Network Codes (SANC): Note from TSB

Data Transmission Service(Recommendation ITU-T X.121 (10/2000)) : 

United States (Federal Communications Commission, Washington)

Telephone Service:

Denmark (Agency for Data Supply and Infrastructure, Copenhagen)

Service Restrictions

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

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Issuer Identifier Numbers for the International Telecommunication Charge Card

List of ITU Carrier Codes

List of Signalling Area/Network Codes (SANC)

List of International Signalling Point Codes (ISPC)

List of Data Network Identification Codes (DNIC)