
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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Country | Tone | Frequency/Hz | Cadence/s | Audio |
Kazakhstan | Off-hook warning tone | 1400+2060+2450+2600 | 0.1 on 0.1 off | ![]() |
Malta | Off-hook warning tone | 425 | 0.32 on 0.32 off | |
Turkey | Off-hook warning tone | 1400+2060+2450+2600 | 0.1 on 0.1 off | |
United States | Off-hook warning tone |