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 |
| Lao | Busy tone | 425 | 1.0 on 1.0 off |  |
| Lao | Confirmation tone | 950 | continuous | |
| Lao | Congestion tone | 425 | 0.375 on 0.375 off | |
| Lao | Dial tone | |||
| Lao | Number unobtainable tone | |||
| Lao | Ringing tone | |||
| Lao | Special dial tone | |||
| Lao | Waiting tone | |||
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