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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|Sao Tome & Principe||Busy tone||425||0.5 on 0.5 off|
|Sao Tome & Principe||Call waiting tone||425||0.2 on 1.0 off|
|Sao Tome & Principe||Dial tone||425||continuous|
|Sao Tome & Principe||Ringing tone|
|Sao Tome & Principe||Special information tone|