Yealink SIP-T48U Administrator's Guide

Troubleshooting Methods
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Troubleshooting Methods
Yealink phones provide feedback in a variety of forms such as log files, packets, status indicators and so on, which
can help you more easily find the system problem and fix it.
Topics
Log Files
Resetting Phone and Configuration
Packets Capture
Watch Dog
Network Diagnostics
Analyzing Configuration Files
Exporting All the Diagnostic Files
Device Status
Phone Reboot
Exporting All the Diagnostic Files
Yealink phones support three types of diagnostic files (including Pcap trace, log files, and BIN configuration files) to
help analyze your problem. You can export these files at a time and troubleshoot if necessary. The file format of the
exported diagnostic file is *.tar.
Procedure:
1. From the web user interface, navigate to Settings > Configuration.
2. Click Start in the Export All Diagnostic Files field to begin capturing signal traffic.
The system log level will be automatically set to 6.
3.
Reproduce the issue.
4. Click Stop in the Export All Diagnostic Files field to stop the capture.
The system log level will be reset to 3.
5. Click Export to open the file download window, and then save the diagnostic file to your local system.
A diagnostic file named <MAC>-DiagnoseInfo.tar is successfully exported to your local system.
Note: After exporting the diagnostic files, you can create a ticket to describe your problem at ticket.yealink.com, and Yealink
support team will help you locate the root cause.
Log Files
You can configure your device to generate the log files locally, upload the log to the USB flash drive connected to
the phone or sent the log to a syslog server in real time, and use these log files to generate informational, analytic
and troubleshoot phones.
Topics
Local Logging
Syslog Logging
Local Logging
You can enable local logging, specify the severity level, and choose to keep the log locally, upload the log to the
USB flash drive connected to the phone or upload the local log files to the provisioning server.
Topics
Local Logging Configuration
Exporting the Log Files to a Local PC
Uploading Log to the USB Flash Drive

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm