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 |
| India | Acceptance tone | 400 | 1.0 on 4.0 off |  |
| India | Busy tone | 400 | 0.75 on 0.75 off | |
| India | Call waiting tone | 400 | 0.2 on 0.1 off 0.2 on 7.5 off | |
| India | Congestion tone | |||
| India | Dial tone | |||
| India | Disconnect tone | |||
| India | Holding tone | |||
| India | Intrusion tone | |||
| India | Refusal tone | |||
| India | Ringing tone - I, local calls | |||
| India | Ringing tone - II, nsd/isd calls | |||
| India | Route tone | |||
| India | Special dial tone | |||
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