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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|Sudan||Busy tone||425||1.0 on 1.0 off|
|Sudan||Call waiting tone||425||0.15 on 0.15 off 0.15 on 4.0 off|
|Sudan||Congestion tone||425||0.375 on 0.375 off|
|Sudan||Special information tone|