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 |
| Bangladesh | Busy tone | 450 | 0.2 on 0.3 off 0.7 on 0.8 off |  |
| Bangladesh | Call waiting tone | 450 | 3.0 on 10.0 off | |
| Bangladesh | Congestion tone | 450 | 0.25 on 0.25 off | |
| Bangladesh | Dial tone | |||
| Bangladesh | Howler tone | |||
| Bangladesh | Pay tone | |||
| Bangladesh | Ringing tone | |||
| Bangladesh | Special dial tone | |||
| Bangladesh | Warning tone - operator intervening | |||
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