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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| Country | Tone | Frequency/Hz | Cadence/s | Audio |
| Bhutan | Busy tone | 400 | 0.6 on 0.6 off |  |
| Bhutan | Dial tone | 400x25 | continuous | |
| Bhutan | Number unobtainable tone | 400 | continuous | |
| Bhutan | Ringing tone | |||
| Bhutan | Trunk offering tone | |||
| Bhutan | Waiting tone | |||
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