Yealink SIP-T48U Administrator's Guide

Troubleshooting Solutions
557
l Ensure that the configuration is applicable to the IP phone model.
l The configuration may depend on support from a server.
System Log Issues
Fail to export the system log to a provisioning server (FTP/TFTP server)
Do one of the following:
l Ensure that the FTP/TFTP server is downloaded and installed on your local system.
l Ensure that you have configured the FTP/TFTP server address correctly via the web user interface on your IP
phone.
l Reboot the phone. The configurations require a reboot to take effect.
Fail to export the system log to a syslog server
Do one of the following:
l Ensure that the syslog server can save the syslog files exported from the IP phone.
l Ensure that you have configured the syslog server address correctly via the web user interface on your IP phone.
l Reboot the phone. The configurations require a reboot to take effect.
Protocols and Ports Issues
What communication protocols and ports do Yealink IP phones sup-
port?
Source
Device
Source IP Source Port
Destination
Device
Destination
IP
Destination
Port (Listen-
ing port)
Protocol
Description of des-
tination port
IP
phones
IP address of
IP phones
2~65535
IP phone or
voice gate-
way
IP address
of IP phone
or voice
gateway
Determined
by des-
tination
device.
UDP
RTP protocol port, it is
used to send or receive
audio stream.
1024~65535 SIP Server
IP address
of SIP
server
Determined
by des-
tination
device.
UDP/TCP
SIP protocol port, it is
used for signaling inter-
action with SIP server.
1024~65535
TR-069
Server
IP address
of TR-069
server
Determined
by des-
tination
device.
TCP
TR-069 protocol port, it is
used to communicate
with TR-069server.
1024~65535 File server
IP address
of file server
Determined
by des-
tination
device.
TCP
HTTP protocol port, it is
used to download file.
1024~65535
Remote
phone book
server
IP address
of remote
phone book
server
Determined
by des-
tination
device.
TCP
HTTP protocol port, it is
used to access the
remote phone book.
1024~65535 AA
IP address
of AA
Determined
by des-
tination
device.
TCP
HTTP protocol port, it is
used for AA com-
munication.
68
DHCP
Server
IP address
of DHCP
67 UDP
DHCP protocol port, it is
used to obtain IP address

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