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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