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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|Kazakhstan||Off-hook warning tone||1400+2060+2450+2600||0.1 on 0.1 off|
|Malta||Off-hook warning tone||425||0.32 on 0.32 off|
|Turkey||Off-hook warning tone||1400+2060+2450+2600||0.1 on 0.1 off|
|United States||Off-hook warning tone|