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 |
| Slovak Republic | Busy tone | 425 | 0.33 on 0.33 off |  |
| Slovak Republic | Call waiting tone | 425 | 0.33 on 9.0 off | |
| Slovak Republic | Caller waiting tone | 425 | 1.00 on 0.17 off 0.33 on 3.50 off | |
| Slovak Republic | Conference tone | |||
| Slovak Republic | Congestion tone | |||
| Slovak Republic | Dial tone - I | |||
| Slovak Republic | Dial tone - II, pabx | |||
| Slovak Republic | Pay tone - I, cards | |||
| Slovak Republic | Pay tone - II, coins | |||
| Slovak Republic | Ringing tone | |||
| Slovak Republic | Special dial tone | |||
| Slovak Republic | Special information tone | |||
| Slovak Republic | Trunk offering tone | |||
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