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 |
| Denmark | Busy tone - I | 425 | 0.25 on 0.25 off |  |
| Denmark | Busy tone - II, plmn/gsm | 425 | 0.5 on 0.5 off | |
| Denmark | Call waiting tone - I | 425 | 0.2 on 0.2 off 0.2 on 3.6 off 0.2 on 0.2 off 0.2 on | |
| Denmark | Call waiting tone - II, plmn/gsm | |||
| Denmark | Congestion tone - I | |||
| Denmark | Congestion tone - II, plmn/gsm | |||
| Denmark | Dial tone | |||
| Denmark | Ringing tone | |||
| Denmark | Special information tone | |||
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