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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|Chad||Busy tone||440||0.5 on 0.5 off|
|Chad||Ringing tone||440||1.7 on 3.3 off|
|Chad||Second dial tone|
|Chad||Special information tone|