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Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones

Web User Interface:

Settings->Voice->Echo Cancellation->VAD

Phone User Interface:

To configure VAD via web user interface:

Click on Settings->Voice.

Select the desired value from the pull-down list of VAD.

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.

VAD is used to send CN packets when phone detect a "silence" period; CNG is used to

generate comfortable noise when phone receives CN packets from the other side.

Permitted Values