The following audible (call progress) tones and power levels are used in North America (full definition see ANSI T1.401 Appendix D 1988).
|Dial tone||350 + 440||Steady on|
|Message Waiting||350 + 440||10 bursts (0.1sec on, 0.1 sec off) then steady on|
|Recall dial tone/
|350 + 440||3 bursts (0.1 sec on, 0.1 sec off) then steady on|
|Line busy||480 + 620||0.5 sec on, 0.5 sec off, repeating|
|Reorder||480 + 620||0.25 sec on, 0.25 sec off, repeating|
|Audible Ringing||440 + 480||2 sec on, 4 set off, repeating|
|Name||350 Hz||440 Hz||480 Hz||620 Hz|
|-29 to -10 dBm||-29 to -10 dBm|
|-52 to -21 dBm||-52 to -21 dBm|
|Ringing||-47 to -16 dBm||-47 to -16 dBm|
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