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 |
| Botswana | Line lock-out tone | 425 | 5.0 on 1.0 off |  |
| El Salvador | Line lock-out tone | 425 | 0.167 on 0.167 off 0.500 on 0.167 off | |
| Ethiopia | Line lock-out tone | 425 | 0.4 on 0.4 off | |
| Fiji | Line lock-out tone | |||
| Ivory Coast | Line lock-out tone | |||
| Kuwait | Line lock-out tone | |||
| Qatar | Line lock-out tone | |||
| Samoa | Line lock-out tone | |||
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