ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1317	1.VI.2025	(Information received by 15 May 2025)   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

Telephone Service:

Morocco (Agence Nationale de Réglementation des Télécommunications (ANRT), Rabat)

Venezuela (Comisión Nacional de Telecomunicaciones (CONATEL), Caracas)

Service Restrictions

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

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Issuer Identifier Numbers

Mobile Network Codes (MNC) for the international identification plan for public networks
and subscriptions

List of ITU Carrier Codes

List of International Signalling Point Codes (ISPC)

National Numbering Plan

Annex:

List of Data Network Identification Codes (DNIC) (According to ITU-T Recommendation X.121 (10/2000))
(Position on 1 June 2025)