Yealink SIP-T43U Getting Started

Recovery Mode on Yealink IP phones
15
Procedures
1. Long press (Speakerphone key) and reconnect the power adapter to trigger the recovery
mode. Do not release until the recovery mode selection screen appears on the phone LCD
screen.
Note
2. Press 2 on the phone keypad to use USB flash drive.
The IP phone will read and upgrade the firmware from the USB flash drive.
After upgrading, the IP phone will initialize successfully and get ready for use. The LCD screen
prompts “Initializing…Please wait” when upgrading successfully.
3. If the IP phone fails to upgrade, the LCD screen will indicate the failure. You need to check and make
sure:
 The file system of the USB flash drive should be FAT32.
 The USB flash drive has been successfully connected to the IP phone.
 The resource files are correctly renamed and placed on the USB flash drive.
 Repeat the recovery mode procedures to try again.
The LCD screen prompts “Update failed (-1)” when failing to upgrade:
4. Press to verify the current firmware version after upgrading successfully.
Note
…. Update failed (-1) ….
For CP920, you need to long press the specified soft key (the second from the left on the phone)
since there is no Speakerphone key.
Press 1 to use the TFTP server. For more information on recovery mode using the TFTP server,
refer to For SIP Phone Series.
Welcome
.... Initializing…Please wait ….
You need to tap Settings->Status (for VP59/SIP-T58A IP phones) or tap Menu->Settings (for
SIP-T57W IP phones) to verify the current firmware version since there is no key.
1. TFTP
2: USB

Yealink SIP-T43U Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Wall mountable	Yes
Sustainability certificates	REACH, RoHS
AC adapter input voltage	100 - 240 V
AC adapter output current	1.2 A
AC adapter output voltage	5 V
Power consumption (typical)	2.2 W
Bluetooth version	4.1
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	FTP/TFTP/HTTP/HTTPS, IPv6, LLDP/CDP/DHCP VLAN
USB 2.0 ports quantity	2
Lines quantity	12 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	12
Voice codecs	AGC, AJB, AMR-NB, AMR-WB, G.711Mu, G.711a, G.723.1, G.726, G.729ab, OPUS, PLC, VAD, iLBC
Number of handles included	1 pc(s)
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Display diagonal	3.7 \
Display resolution	360 x 160 pixels
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	206.2 mm
Width	224.9 mm
Height	174.9 mm
Package depth	223 mm
Package width	246 mm
Package height	120 mm