apivio Liberty L2 Administrator's Manual page 50

Audio
▣ Audio Options
♦
VAD : If Voice Active Detection(VAD) is enabled and there is no or little sound to the mic or when MUTE button is
pressed, data transfer is limited and CNG packets instead of RTP packets are set in order to reduce the network
traffic, and giving white noise to the phone of the other party.
♦
CNG : sends white noise through each speaker when CNG (Comfort Noise Generation) is enabled.
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Admin Manual
Liberty L2 (WP300S)