Yealink SIP-T2XP Administrator's Manual page 471

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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.

CNG can be configured using the configuration files or locally.

Configuration File

Details of the Configuration Parameter:

Description:

Enables or disables CNG (Comfortable Noise Generator) feature on the IP phone.

Web User Interface:

Settings->Voice->Echo Cancellation ->CNG

Phone User Interface:

<y0000000000xx>.cfg

Web User Interface

Permitted Values

Configuring Audio Features

Configure CNG.

Configure CNG.

Navigate to:

http://<phoneIPAddress>/

servlet?p=settings-voice&