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Tech Stuff - Network Tones

The following audible (call progress) tones and power levels are used in North America (full definition see ANSI T1.401 Appendix D 1988).

Name Frequency (Hz) Pattern
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/
Confirmation 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

Power Levels

Name 350 Hz 440 Hz 480 Hz 620 Hz
Dial tone
Message Waiting
Recall
-29 to -10 dBm -29 to -10 dBm    
Line Busy
Reorder
    -52 to -21 dBm -52 to -21 dBm
Ringing   -47 to -16 dBm -47 to -16 dBm  


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