Yealink SIP-T48U Getting Started

Recovery Mode on Yealink IP phones
7
1. Long press (Speakerphone key) and reconnect the power adapter to trigger the recovery
mode. Do not release until the recovery mode wizard appears on the phone LCD screen.
2. Press 1 to use the HTTP server.
3. Enter the desired values in the IP Address, Netmask, IP Gateway and HTTP Server fields
respectively.
Note
4. Press to complete the recovery mode.
The IP phone will download and upgrade the firmware from the HTTP server. After upgrading, the IP
phone will initialize successfully and get ready for use.
The LCD screen prompts “Initializing…Please Wait” when upgrading successfully.
Note
5. If the IP phone fails to upgrade, the LCD screen will indicate the failure. The user can repeat the
recovery mode procedures to try again.
For CP920 IP phones, you need to press the volume key ( or ) as the left or right
navigation key.
For SIP-T58A IP phones, you need to press / / as up/down/left/right
navigation key.
You need to press (for SIP-T58A phones), (for SIP-T3 IP phones) to complete the
recovery mode since there is no key.
…. Initializing ….
Please Wait
Welcome
IP Address:
Netmask:
IP Gateway:
HTTP Server:
10. 2. 11.124
255.255.255. 0
10. 2. 11.254
http://10.2.11.10
1

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