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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|China||Busy tone||450||0.35 on 0.35 off|
|China||Congestion tone||450||0.7 on 0.7 off|
|China||Number unobtainable tone|
|China||Second dial tone|
|China||Special information tone - I|
|China||Special information tone - II|