Yealink SIP-T38G Administrator's Guide

Configuring Advanced Features
167
Voice QoS
For VoIP transmissions to be intelligible to the receiver, voice packets should not be
dropped, excessively delayed, or suffer varying delay. DiffServ model can guarantee
high-quality voice transmission when the voice packets are configured higher DSCP
value.
SIP QoS
SIP protocol is used for creating, modifying and terminating two-party or multi-party
sessions. To ensure good voice quality, the SIP packets emanating from the IP phone
should be configured a high transmission priority.
You can specify DSCPs for voice packets and SIP packets respectively.
Note
Procedure
DSCPs for voice packets and SIP packets can be configured using the configuration files
or locally.
Configuration File
<y0000000000xx>.cfg
Configure the DSCPs for voice
packets and SIP packets.
For more information, refer to
QOS on page 296.
Local
Web User Interface
Configure the DSCPs for voice
packets and SIP packets.
Navigate to:
http://<phoneIPAddress>/cgi-bi
n/cgiServer.exx?page=Networ
k-Adv.htm
To configure DSCPs for voice packets and SIP packets via web user interface:
1. Click on Network->Advanced.
2. Enter the desired value (0-63) in the Voice QoS field.
The DSCP value of voice traffic in the received LLDP packet will override the manual
configuration.

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