
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.
Business customers subscribing to our paid premium service can benefit from unrestricted searching of over 1,700 records, update notifications and support, for up to ten users, ad-free.
Help us improve! If you have updated information on Disconnect tones or official versions of national tone plans, please let us know.
Country | Tone | Frequency/Hz | Cadence/s | Audio |
Bulgaria | Busy tone - I | 425 | 0.5 on 0.5 off | ![]() |
Bulgaria | Busy tone - II | 425 | 0.2 on 0.5 off | |
Bulgaria | Busy tone - III | 425 | 0.25 on 0.25 off | |
Bulgaria | Busy tone - IV | |||
Bulgaria | Call waiting tone - I | |||
Bulgaria | Call waiting tone - II | |||
Bulgaria | Call waiting tone - III | |||
Bulgaria | Congestion tone - I | |||
Bulgaria | Congestion tone - II | |||
Bulgaria | Congestion tone - III | |||
Bulgaria | Dial tone - I | |||
Bulgaria | Dial tone - II | |||
Bulgaria | Dial tone - III | |||
Bulgaria | Dial tone - IV | |||
Bulgaria | Disconnect tone | |||
Bulgaria | Disconnect tone | |||
Bulgaria | Holding tone - I | |||
Bulgaria | Holding tone - II | |||
Bulgaria | Intrusion tone - I | |||
Bulgaria | Intrusion tone - II | |||
Bulgaria | Intrusion tone - III | |||
Bulgaria | Payphone recognition tone | |||
Bulgaria | Ringing tone - I | |||
Bulgaria | Ringing tone - II | |||
Bulgaria | Ringing tone - III | |||
Bulgaria | Special dial tone | |||
Bulgaria | Special information tone | |||
Bulgaria | Warning tone - I | |||
Bulgaria | Warning tone - II |