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 |
| Nigeria | Busy tone | 400 | 0.5 on 0.5 off |  |
| Nigeria | Call waiting tone | 400 | 0.2 on 0.2 off | |
| Nigeria | Congestion tone | 400 | 0.25 on 0.25 off | |
| Nigeria | Dial tone | |||
| Nigeria | Holding tone | |||
| Nigeria | Number unobtainable tone | |||
| Nigeria | Recall dial tone | |||
| Nigeria | Ringing tone | |||
| Nigeria | Special dial tone | |||
| Nigeria | Special information tone | |||
| Nigeria | Warning tone - operator intervening | |||
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