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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|Sri Lanka||Busy tone||425||0.75 on 0.75 off|
|Sri Lanka||Call waiting tone||425||0.5 on 2.5 off|
|Sri Lanka||Congestion tone||425||0.25 on 0.25 off|
|Sri Lanka||Dial tone|
|Sri Lanka||Disconnect tone|
|Sri Lanka||Holding tone|
|Sri Lanka||Intrusion tone|
|Sri Lanka||Number unobtainable tone|
|Sri Lanka||Ringing tone|
|Sri Lanka||Route tone|
|Sri Lanka||Special information tone|
|Sri Lanka||Warning tone|