International Telecommunication Union   ITU
Site Map Contact us Print Version
 Wednesday, 04 May 2005

The ITU Operational Bulletin was first published by the ITU more than 35 years ago and continues today to provide all administrations, operators and service providers as a favoured medium for the exchange of essential information on changes in international telecommunications networks and services.

List of Codes and Numbers - Lists published by TSB or BR as Annexes to the ITU Operational Bulletin