Yealink SIP-T40G Administrator's Guide

Audio Features
174
Acoustic Echo Cancellation (AEC)
Noise Suppression
Background Noise Suppression (BNS)
Automatic Gain Control (AGC)
Voice Activity Detection (VAD)
Comfort Noise Generation (CNG)
Jitter Buffer
Smart Noise Block
Acoustic Shield
Smart Noise Filtering
Acoustic Echo Cancellation (AEC)
Yealink phones employ advanced AEC for hands-free operation. You can configure the AEC feature to remove the
echo of the local loudspeaker from the local microphone without removing the near-end speech.
AEC is not normally required for calls via the handset. In some cases, where echo is experienced by the remote
party, AEC may be used to reduce/avoid echo when you use the handset.
Note: Utilizing acoustic echo cancellation will introduce a small increase of delay into an audio path which might cause a
lower voice quality.
Topic
AEC Configuration
AEC Configuration
The following table lists the parameter you can use to configure AEC.
Parameter
voice.echo_cancellation <y0000000000xx>.cfg
Description
It enables or disables the AEC (Acoustic Echo Canceller) feature.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Web UI
Settings > Voice > Echo Cancellation > ECHO
Noise Suppression
The impact noise in the room is picked-up, including paper rustling, coffee mugs, coughing, typing, and silverware
striking plates. These noises, when transmitted to remote participants, can be very distracting.
You can enable the Noise Suppression feature to suppress these noises.
It is only applicable to CP920 phones.
Topic
Noise Suppression Configuration
Noise Suppression Configuration
The following table lists the parameter you can use to configure noise suppression.
Parameter
voice.tns.enable <y0000000000xx>.cfg
Description
It enables or disables the Noise Suppression feature.
Permitted
Values
0-Disabled
1-Enabled

Yealink SIP-T40G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Wi-Fi	No
Security algorithms	AES, HTTPS, SSL/TLS
Networking standards	IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	FTP, TFTP, HTTP, HTTPS
Voice codecs	G.711, G.711a, G.711u, G.722, G.726, G.729ab
RJ-11 ports quantity	1
Ethernet LAN (RJ-45) ports	2
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	1.6 W
Certification	CE, FCC, ISO 9001
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 90 %
Volume control	Digital
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Lines quantity	3 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	3
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	175 mm
Width	212 mm
Height	54 mm