Yealink SIP-T38G Administrator's Guide

Troubleshooting
213
 Ensure that the switch or hub in your network is operational.
― ‖
The phone LCD screen prompts ―No Service‖ message when there is no any available
SIP account on the IP phone.
Do one of the followings:
 Confirm if any account is actively registered on the IP phone at the path
Menu->Status->More->Accounts.
 Check if the SIP parameters of the account have been set up correctly.
Press the OK key when the IP phone is idle to check the basic information of the IP phone,
such as IP address and firmware version.
Do one of the followings:
 Ensure that the target firmware is not the same as the current used firmware.
 Ensure that the target firmware is applicable to the IP phone model.
 Ensure that the current or the target firmware is not protected.
 Ensure that the power is on and the network is available in the process of
upgrading.
 Ensure the web browser is not closed and refreshed when upgrading the firmware
using the web user interface.
Check if you have configured your phone to obtain the time and date from the NTP
server automatically. If your phone is unable to access the NTP server, configure the time
and date manually.
During a call, you may experience poor audio, including intermittent voice, low volume,
echo or other noise. The root cause of audio anomalies can be difficult to diagnose.
 Problems may occur simply because the users are seated too far out of
recommended microphone range and sound faint, or are seated too close to

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