Yealink SIP-T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
173
Default
0
Supported
Devices
All phones except CP920
Web UI
Features > General Information > Headset Prior
Parameter
features.headset.ctrl_call.enable <y0000000000xx>.cfg
Description
It enables or disables the user to initiate or end a call by pressing the HEADSET key.
Note: It works only if “features.headset_mode.enable” is set to 1 (Enabled).
Permitted
Values
0-Disabled
1-Enabled
Default
0
Supported
Devices
All phones except CP920
Dual Headset
The dual headset allows you to use two headsets on one IP phone. To use this feature, you need to physically con-
nect two headsets to the headset and handset jacks respectively. Once the IP phone connects to a call, the headset
connected to the headset jack has the full-duplex capability, with the headset connected to the handset jack is only
used for listening.
Note: The dual headset is not applicable to the Bluetooth headset and USB headset. It is not applicable to CP920 phones.
Topic
Dual Headset Configuration
Dual Headset Configuration
The following table lists the parameter you can use to configure dual headset.
Parameter
features.headset_training <y0000000000xx>.cfg
Description
It enables or disables the dual headset feature.
Note: It works only if “features.headset_mode.enable” is set to 1 (Enabled).
Permitted
Values
0-Disabled
1-Enabled, users can use two headsets on one phone. When the IP phone joins a call, the headset
connected to the headset jack has the full-duplex capability, with the headset connected to the hand-
set jack is only used for listening.
Default
0
Supported
Devices
All phones except CP920
Web UI
Features > General Information > Dual Headset
Acoustic Clarity Technology
To optimize the audio quality in your network, Yealink phones support the acoustic clarity technology: Acoustic
Echo Cancellation (AEC), Background Noise Suppression (BNS), Automatic Gain Control (AGC), Voice Activity
Detection (VAD), Comfort Noise Generation (CNG) and jitter buffer.
Topics

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