Yealink SIP-T31G Administrator's Guide

Audio Features
176
Parameter
voice.tns.enable <y0000000000xx>.cfg
Description
It enables or disables the Noise Suppression feature.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Supported
Devices
CP920
Web UI
Settings > Voice > Noise Proof > Noise Suppression
Background Noise Suppression (BNS)
Background noise suppression (BNS) is designed primarily for hands-free operation and reduces background
noise to enhance communication in noisy environments.
Automatic Gain Control (AGC)
Automatic Gain Control (AGC) is applicable to the hands-free operation and is used to keep audio output at nearly
a constant level by adjusting the gain of signals in some circumstances. This increases the effective user-phone
radius and helps with the intelligibility of soft-talkers.
Voice Activity Detection (VAD)
VAD can avoid unnecessary coding or transmission of silence packets in VoIP applications, saving on computation
and network bandwidth.
Topic
VAD Configuration
VAD Configuration
The following table lists the parameter you can use to configure VAD.
Parameter
voice.vad <y0000000000xx>.cfg
Description
It enables or disables the VAD (Voice Activity Detection) feature.
Permitted
Values
0-Disabled
1-Enabled
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.

Yealink SIP-T31G Specifications

General

Mounting kit	Yes
Number of handles included	1 pc(s)
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	G.722, G.729, AGC, G.729A, AJB, PLC, G.711Mu, VAD, G.711a, G.723.1, G.726, iLBC, CNG, OPUS
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	3 W
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Sustainability certificates	RoHS, REACH
Networking standards	IEEE 802.3af, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	188 mm
Height	162 mm
Package depth	210 mm
Package width	213 mm
Package height	103 mm