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 |
| United Kingdom | Busy tone | 400 | 0.375 on 0.375 off |  |
| United Kingdom | Call waiting tone | 400 | 0.1 on 2~5 off | |
| United Kingdom | Call waiting tone - special | 400 | 0.03 on 0.01 off 0.03 on 6.0 off | |
| United Kingdom | Confirmation tone | |||
| United Kingdom | Congestion tone | |||
| United Kingdom | Congestion tone - special | |||
| United Kingdom | Dial tone | |||
| United Kingdom | Disconnect tone | |||
| United Kingdom | Negative indication tone | |||
| United Kingdom | Number unobtainable tone | |||
| United Kingdom | Pay tone | |||
| United Kingdom | Payphone recognition tone | |||
| United Kingdom | Ringing tone | |||
| United Kingdom | Ringing tone - obsolete | |||
| United Kingdom | Ringing tone - obsolete | |||
| United Kingdom | Special dial tone | |||
| United Kingdom | Special dial tone | |||
| United Kingdom | Special information tone | |||
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