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Change of Tones Notification Form

Change of tones used in national networks (According to ITU-T Recommendation E.180)

• Notification form for Change of tones used in national networks

Note by TSB

• Due to the frequent changes in the tones in the national networks, Study Group 2 has now decided to publish the List, more often, as annex to the ITU Operational Bulletin. The data are listed in the order of the French designations.
• Administrations are reminded of the advantages of standardizing audible tones as far as possible so that subscribers and operators may quickly recognize any tone transmitted of whatever origin.
• In order to have current information and to keep the List up-to-date and also for helping the study of a World Tone Plan, Administrations are strongly requested to submit a concise technical description of any new or changed network tones to the ITU/TSB whenever such tones are introduced, by using the Notification form.