Vad Configuration; Comfort Noise Generation (Cng); Cng Configuration; Jitter Buffer - Yealink SIP-T2 Series Administrator's Manual

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones

VAD Configuration

The following table lists the parameter you can use to configure VAD.
Parameter voice.vad
Description It enables or disables the VAD (Voice Activity Detection) feature on the IP phone.
Permitted
0-Disabled
1-Enabled
Values
Default 0
Web UI Settings->Voice->Echo Cancellation->VAD

Comfort Noise Generation (CNG)

Comfort Noise Generation (CNG) is used to generate background noise for voice communications during periods of
silence in a conversation.
Note
VAD is used to send CN packets when the phone detects a "silence" period; CNG is used to generate comfortable noise
when the phone receives CN packets from the other side.
Topic

CNG Configuration

CNG Configuration
The following table lists the parameter you can use to configure CNG.
Parameter voice.cng
Description It enables or disables the CNG (Comfortable Noise Generation) feature on the IP phone.
0-Disabled
Permitted Values
1-Enabled
Default 0
Web UI Settings->Voice->Echo Cancellation->CNG

Jitter Buffer

Yealink IP phones support two types of jitter buffers: fixed and adaptive. A fixed jitter buffer adds the fixed delay to
voice packets. You can configure the delay time for the static jitter buffer on IP phones. An adaptive jitter buffer is cap-
able of adapting the changes in the network's delay. The range of the delay time for the dynamic jitter buffer added to
packets can be also configured on IP phones.
Topic

Jitter Buffer Configuration

Jitter Buffer Configuration
You can configure the mode of jitter buffer and the delay time for jitter buffer in the wired network or wireless network.
The following table lists the parameters you can use to configure the jitter buffer.
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