ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1334	15.II.2026	(Information received by 30 January 2026)   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

International Identification Plan for Public Networks and Subscriptions: Note from TSB. . 4

Telephone Service:

Mongolia (Communications Regulatory Commission of Mongolia, Ulaanbaatar)

Suriname (Telecommunications Authority Suriname (TAS), Paramaribo)

Service Restrictions.. 15

Call-Back and alternative calling procedures (Res. 21 Rev. PP-06).. 15

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Issuer Identifier Numbers.. 16

Mobile Network Codes (MNC) for the international identification plan  for public networks
and subscriptions.. 17

List of International Signalling Point Codes (ISPC).. 17

National Numbering Plan.... 18