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 |
| Portugal | Acceptance tone - I | 425 | 1.0 on 0.2 off |  |
| Portugal | Acceptance tone - II | 425 | 1.0 on 1.0 off 1.0 on 5.0 off | |
| Portugal | Busy tone - I | 425 | 0.5 on 0.5 off | |
| Portugal | Busy tone - II, mobile | |||
| Portugal | Call waiting tone - I | |||
| Portugal | Call waiting tone - II | |||
| Portugal | Call waiting tone - III | |||
| Portugal | Call waiting tone - IV | |||
| Portugal | Call waiting tone - V | |||
| Portugal | Call waiting tone - VI | |||
| Portugal | Congestion tone | |||
| Portugal | Dial tone | |||
| Portugal | Disconnect tone | |||
| Portugal | Holding tone | |||
| Portugal | Howler tone | |||
| Portugal | Intrusion tone | |||
| Portugal | Refusal tone - I | |||
| Portugal | Refusal tone - II | |||
| Portugal | Ringing tone - I | |||
| Portugal | Ringing tone - II, two party mobiles | |||
| Portugal | Ringing tone - III, three party mobiles | |||
| Portugal | Ringing tone - IV | |||
| Portugal | Special dial tone - mobile | |||
| Portugal | Special information tone | |||
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