Tech Info - 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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Tech Info - Network Tones

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