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 |
| Iceland | Busy tone | 425 | 0.25 on 0.25 off |  |
| Iceland | Congestion tone | 425 | 0.25 on 0.25 off | |
| Iceland | Dial tone | 425 | continuous | |
| Iceland | Number unobtainable tone | |||
| Iceland | Payphone recognition tone | |||
| Iceland | Ringing tone | |||
| Iceland | Special dial tone - call transfer active | |||
| Iceland | Waiting tone | |||
| Iceland | Warning tone | |||
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