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 |
| Belgium | Holding tone | 1400 | 0.4 on 15.0 off |  |
| Botswana | Holding tone | 425 | 5.0 on 5.0 off | |
| Brunei Darussalam | Holding tone | 400x24 | 0.5 on 2.5 off | |
| Bulgaria | Holding tone - I | |||
| Bulgaria | Holding tone - II | |||
| Ghana | Holding tone | |||
| Greece | Holding tone | |||
| India | Holding tone | |||
| Israel | Holding tone | |||
| Jordan | Holding tone | |||
| New Zealand | Holding tone | |||
| Nigeria | Holding tone | |||
| Philippines | Holding tone | |||
| Portugal | Holding tone | |||
| Singapore | Holding tone | |||
| Singapore | Holding tone | |||
| Singapore | Holding tone | |||
| Singapore | Holding tone | |||
| Sri Lanka | Holding tone | |||
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