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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 |
South Africa | Busy tone | 400 | 0.5 on 0.5 off | ![]() |
South Africa | Call waiting tone | 400x33 | 0.4 on 4.0 off | |
South Africa | Comfort tone | 950/950/1400 | 0.65 on 0.325 off 0.325 on 1.3 on 2.6 off | |
South Africa | Congestion tone | |||
South Africa | Dial tone | |||
South Africa | Disconnect tone | |||
South Africa | Disconnect tone | |||
South Africa | Function acknowledge tone | |||
South Africa | Intrusion tone | |||
South Africa | Notify tone | |||
South Africa | Number unobtainable tone | |||
South Africa | Ringing tone | |||
South Africa | Special dial tone | |||
South Africa | Special information tone |