Configuring Audio Features
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2. Select the desired value from the pull-down list of VAD.
3. Click Confirm to accept the change.
Comfort Noise Generation (CNG) is used to generate background noise for voice
communications during periods of silence in a conversation. It is a part of the silence
suppression or VAD handling for VoIP technology. CNG, in conjunction with VAD
algorithms, quickly responds when periods of silence occur and inserts artificial noise
until voice activity resumes. The insertion of artificial noise gives the illusion of a constant
transmission stream, so that background sound is consistent throughout the call and the
listener does not think the line has released. The purpose of VAD and CNG is to maintain
an acceptable perceived QoS while simultaneously keeping transmission costs and
bandwidth usage as low as possible.
Procedure
CNG can be configured using the configuration files or locally.
Configure CNG.
For more information, refer to
Comfort Noise Generation on
page 396.
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