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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|Liberia||Busy tone||425||0.5 on 0.5 off|
|Liberia||Number unobtainable tone||425||0.6 on 0.2 off 0.2 on 0.2 off 0.2 on 0.2 off 0.2 on 0.2 off|