Yealink SIP-T38G Administrator's Guide

Administrator’s Guide for SIP-T3xG IP Phones
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sensitive microphones and cause feedback.
 Intermittent voice is mainly caused by packet loss and jitter. Packet loss may due to
network congestion. Jitter is mainly due to message recombination of transmission
or receiving equipment, such as timeout handling, retransmission mechanism or
buffer under run.
 Noisy equipment, such as a computer or a fan, may make it difficult for hear the
voice from the other party clearly. Turn off any other noisy equipment in the room
such as fans.
 A line issue may also cause this problem. Disconnect the old line and redial the call
to see if another line provides better connection.
A remote phonebook is placed on a server, while a local phonebook is placed on the IP
phone flash. A remote phonebook can be used by everyone that can access the server,
while a local phonebook can only be used by a specific phone itself. A remote
phonebook is always used as a central phonebook for a company. That is, every stuff in
the company can load this phonebook and each time they are trying to open a remote
phonebook, the data is passed real-time from the certain server.
Both user name and register name are defined by the server. A user name is used to
identify the account while a register name matched with a password is used for
authentication if the server requires. Display name is the caller ID that will be displayed
on the callee’s phone LCD screen. Some servers also define the display name so this
parameter set on the IP phone may not take effect.
Yes. The IP phone will reboot only if the header in a SIP NOTIFY message contains an
additional string ―reboot=true‖. The message is formed as shown:
NOTIFY sip:<user>@<dsthost> SIP/2.0
To: sip:<user>@<dsthost>
From: sip:sipsak@<srchost>
CSeq: 10 NOTIFY

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