Yealink SIP-T23G Administrator's Guide

Firmware Upgrade
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Firmware Upgrade
There are two methods of firmware upgrade:
l Manually, from the local system for a single device via the web user interface.
l Automatically, from the provisioning server for a mass of devices.
Note: We recommend that the devices running the latest firmware should not be downgraded to an earlier firmware version.
The new firmware is compatible with old configuration parameters, but not vice versa.
All configurations will be cleared on the T23P/T23G/T21(P) E2/T19(P) E2 phones when downgrading the phones from firm-
ware version 84 to 83.
Topics
Firmware for Each Phone Model
Firmware Upgrade Configuration
Firmware for Each Phone Model
You can download the latest firmware online: http://sup-
port.yealink.com/documentFront/forwardToDocumentFrontDisplayPage.
The following table lists the associated and latest firmware name for each device model (X is replaced by the actual
firmware version).
IP Phone Model Firmware Name Example
T57W/T54W/T53W/T53
(T5W firmware unified)
96.x.x.x.rom 96.85.0.10.rom
T48U/T46U/T43U/T42U
(T4U firmware unified)
108.x.x.x.rom 108.84.0.30.rom
T48S/T46S/T42S/T41S
(T4S firmware unified)
66.x.x.x.rom 66.84.0.80.rom
T48G 35.x.x.x.rom 35.83.0.30.rom
T46G 28.x.x.x.rom 28.83.0.30.rom
T42G 29.x.x.x.rom 29.83.0.30.rom
T41P 36.x.x.x.rom 36.83.0.30.rom
T40P 54.x.x.x.rom 54.84.0.60.rom
T40G 76.x.x.x.rom 76.84.0.60.rom
T29G 46.x.x.x.rom 46.83.0.30.rom
T27G 69.x.x.x.rom 69.84.0.80.rom
T23P/G 44.x.x.x.rom 44.84.0.60.rom
T21(P) E2 52.x.x.x.rom 52.84.0.60.rom
T19(P) E2 53.x.x.x.rom 53.84.0.60.rom
CP920 78.x.x.x.rom 78.84.0.80.rom

Yealink SIP-T23G Specifications

General

Backlight	Yes
Voice codecs	G.711a, G.722.2, G.726, G.729ab, iLBC
Volume control	Digital
Handset type	Wired handset
Product type	IP Phone
Product color	Black, Silver
Display resolution	132 x 64 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	3
Networking standards	IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x, IEEE 802.3af
Ethernet LAN (RJ-45) ports	2
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	1.56 W
Number of handles included	- pc(s)
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %

Weight and Dimensions

Depth	188 mm
Width	209 mm
Height	150 mm