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.
Business customers subscribing to our paid premium service can benefit from unrestricted searching of over 1,700 records, update notifications and support, for up to ten users, ad-free.
Help us improve! If you have updated information on Disconnect tones or official versions of national tone plans, please let us know.
| Country | Tone | Frequency/Hz | Cadence/s | Audio |
| Australia | Intrusion tone | 425 | 1.0 on 15.0 off 0.36 on 15.0 off |  |
| Australia | Intrusion tone | 425 | continuous | |
| Australia | Intrusion tone | 525 | 1.0 on 15.0 off 0.36 on 15.0 off | |
| Australia | Intrusion tone | |||
| Botswana | Intrusion tone | |||
| Bulgaria | Intrusion tone - I | |||
| Bulgaria | Intrusion tone - II | |||
| Bulgaria | Intrusion tone - III | |||
| China | Intrusion tone | |||
| Egypt | Intrusion tone | |||
| El Salvador | Intrusion tone | |||
| Ethiopia | Intrusion tone | |||
| Greece | Intrusion tone | |||
| India | Intrusion tone | |||
| Jordan | Intrusion tone | |||
| Macedonia | Intrusion tone | |||
| Malawi | Intrusion tone | |||
| Norway | Intrusion tone | |||
| Oman | Intrusion tone | |||
| Paraguay | Intrusion tone | |||
| Portugal | Intrusion tone | |||
| Singapore | Intrusion tone | |||
| South Africa | Intrusion tone | |||
| Sri Lanka | Intrusion tone | |||
| Tanzania | Intrusion tone | |||
| United States | Intrusion tone | |||
| United States | Intrusion tone | |||
| United States | Intrusion tone | |||
| United States | Intrusion tone | |||
| United States | Intrusion tone | |||
Corporate user? Please consider sponsoring this service by getting a paid subscription for your institution.