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 |
| China | Busy tone | 450 | 0.35 on 0.35 off |  |
| China | Congestion tone | 450 | 0.7 on 0.7 off | |
| China | Dial tone | 450 | continuous | |
| China | Disconnect tone | |||
| China | Intrusion tone | |||
| China | Number unobtainable tone | |||
| China | Ringing tone | |||
| China | Second dial tone | |||
| China | Special information tone - I | |||
| China | Special information tone - II | |||
| China | Waiting tone | |||
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