Welcome to the World Tone Database, dedicated to the A-Z of international call progress tones. From here you can research tone parameters in national tone plans and hear the tones on-line.
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|Austria||Negative indication tone||380+420||0.4 on 0.4 off|
|Cuba||Negative indication tone|
|Hungary||Negative indication tone|
|Kyrgyz Republic||Negative indication tone|
|Liechtenstein||Negative indication tone|
|United Kingdom||Negative indication tone|
|Uruguay||Negative indication tone|