Yealink SIP-T40G Administrator's Guide

Audio Features
176
Default
1
Web UI
Settings > Voice > Echo Cancellation > CNG
Jitter Buffer
Yealink 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 the phones. An adaptive jitter buffer is
capable 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 the 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 net-
work.
The following table lists the parameters you can use to configure the jitter buffer.
Parameter
voice.jib.adaptive <y0000000000xx>.cfg
Description
It configures the type of jitter buffer in the wired network.
Permitted
Values
0-Fixed
1-Adaptive
Default
1
Web UI
Settings > Voice > Jitter Buffer > Type
Parameter
voice.jib.min <y0000000000xx>.cfg
Description
It configures the minimum delay time (in milliseconds) of the jitter buffer in the wired network.
Note: It works only if “voice.jib.adaptive” is set to 1 (Adaptive). The value of this parameter should be
less than or equal to that of “voice.jib.normal”.
Permitted
Values
Integer from 0 to 400
Default
60
Web UI
Settings > Voice > Jitter Buffer > Min Delay
Parameter
voice.jib.max <y0000000000xx>.cfg
Description
It configures the maximum delay time (in milliseconds) of the jitter buffer in the wired network.
Note: It works only if “voice.jib.adaptive” is set to 1 (Adaptive). The value of this parameter should be
greater than or equal to that of “voice.jib.normal”.
Permitted
Values
Integer from 0 to 400
Default
240
Web UI
Settings > Voice > Jitter Buffer > Max Delay
Parameter
voice.jib.normal <y0000000000xx>.cfg
Description
It configures the normal delay time (in milliseconds) of the jitter buffer in the wired network.
Note: It works only if “voice.jib.adaptive” is set to 0 (Fixed). The value of this parameter should be
greater than or equal to that of “voice.jib.min” and less than or equal to that of “voice.jib.max”.

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