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 |
| El Salvador | Busy tone | 425 | 0.32 on 0.32 off |  |
| El Salvador | Call waiting tone | 425 | 0.35 on 15.0 off | |
| El Salvador | Congestion tone | 425 | 0.32 on 0.32 off | |
| El Salvador | Dial tone | |||
| El Salvador | Intrusion tone | |||
| El Salvador | Line lock-out tone | |||
| El Salvador | Ringing tone | |||
| El Salvador | Special dial tone | |||
| El Salvador | Special information tone | |||
| El Salvador | Warning tone | |||
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