Motorola nvg589 Administrator's Hanbook page 166

Administrator's Handbook
set voip phone n dsp-settings echo-max-attenuation [ 0 - 65535 ]
echo-max-attenuation – specifies the maximum attenuation level at which to invoke echo cancellation. Default is
16384.
set voip phone n dsp-settings echo-tail-length [ 0 - 65535 ]
echo-tail-length – specifies the duration of an echo tail required to invoke cancellation. Default is 0.
set voip phone n dsp-settings vad-option [ off | on ]
When vad-option is set to on – enables Voice Activity Detection/Comfort Noise Generation. When speech is not
present, the CNG algorithm generates a noise signal at the level sent from the transmit side.
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