Yealink SIP-T38G Administrator's Guide

Administrator’s Guide for SIP-T3xG IP Phones
180
Jitter buffer is a shared data area where voice packets can be collected, stored, and
sent to the voice processor in evenly spaced intervals. Jitter is variations in packet
arrival time, can occur because of network congestion, timing drift or route changes.
The jitter buffer, which is located at the receiving end of the voice connection,
intentionally delays the arriving packets so that the end user experiences a clear
connection with very little sound distortion. There are two types of jitter buffers: static
and dynamic. The IP phones support these two types of jitter buffer. A static jitter buffer
adds the fixed delay to voice packets. You can configure the delay time for the static
jitter buffer on the IP phone. The default delay time is 120ms. A dynamic 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 also be configured on the IP phone. The
dynamic jitter buffer is enabled on the IP phone by default and the valid delay time
ranges from is 0 to 300ms.
Procedure
Jitter buffer can be configured using the configuration files or locally.
Configuration File
<y0000000000xx>.cfg
Configure the mode of jitter
buffer and the delay time for
jitter buffer.
For more information, refer to
Jitter Buffer on page 303.
Local
Web User Interface
Configure the mode of jitter
buffer and the delay time for
jitter buffer.
Navigate to:
http://<phoneIPAddress>/cgi-bi
n/cgiServer.exx?page=Phone-V
oice.htm
To configure Jitter Buffer via web user interface:
1. Click on Phone->Voice.
2. Mark the desired radio box in the Type field.
3. Enter the minimum delay time for adaptive jitter buffer in the Minimum Delay field.
4. Enter the maximum delay time for adaptive jitter buffer in the Maximum Delay
field.

Yealink SIP-T38G Specifications

General

Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Keypad number of keys	48
Touchscreen	-
Display resolution	480 x 272 pixels
Display number of colors	16.78 million colors
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Voice codecs	G.711, G.722, G.723.1, G.726
Bluetooth	No
Security algorithms	802.1x RADIUS, HTTPS, SSL/TLS
AC adapter input voltage	100 - 240 V
AC adapter output voltage	5 V
Power consumption (typical)	4.6 W
Operating relative humidity (H-H)	10 - 95 %
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Compliance industry standards	IEEE 802.3af
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	204 mm
Width	273 mm
Height	42 mm
Weight	1050 g