Comfort Noise Generation - Yealink SIP T46G Administrator's Manual

Comfort Noise Generation (CNG) is used to generate background noise for voice
communications during periods of silence that occur during the conversation. It is part of
the silence suppression or VAD handling for VoIP technology. CNG, in conjunction with
VAD algorithms, quickly determines 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.
Configuration File
Local
To configure CNG via web user interface:
1. Click on Settings->Voice.
2. Select the desired value from the pull-down list of CNG.
3. Click Confirm to accept the change.
<y000000000028>.cfg
Web User Interface
Configuring Audio Features
Configure the CNG feature.
For more information, refer to

Comfort Noise Generation

page 337.
Configure the CNG feature.
Navigate to:
http://<phoneIPAddress>/servl
et?p=settings-voice&q=load
on
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