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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|0.5 on 0.5 off
|Call waiting tone
|0.15 on 0.15 off 0.15 on 10.0 off
|0.25 on 0.25 off
|Payphone recognition tone
|Special information tone