Grandstream Networks UCM6208 - Figure 28: Busy Tone Frequencies

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UCM6XXX Analog Trunks Guide
Figure 28: Busy Tone Frequencies
In this example we have only one frequency Peak, hence the Busy tone frequencies are f1=436Hz@-
20dB and f2=0Hz@–20dB. (We have rounded the attenuation value to -20dB).