Yealink T40G Administrator's Guide

Firmware Upgrade
91
Firmware Upgrade
There are two methods of firmware upgrade:
 Manually, from the local system for a single phone via web user interface.
 Automatically, from the provisioning server for a mass of phones.
Note
We recommend that IP phones 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.
Topics
Firmware for Each Phone Model
Firmware Upgrade Configuration
Firmware for Each Phone Model
You can download the latest firmware online:
http://support.yealink.com/documentFront/forwardToDocumentFrontDisplayPage.
The following table lists the associated and latest firmware name for each IP phone model (X is replaced
by the actual firmware version).
IP Phone Model
Firmware Name
Example
T54S/T52S
(T5S firmware unified)
70.x.x.x.rom
70.83.0.10.rom
T48S/T46S/T42S/T41S
(T4S firmware unified)
66.x.x.x.rom
66.83.0.10.rom
T48G
35.x.x.x.rom
35.83.0.10.rom
T46G
28.x.x.x.rom
28.83.0.10.rom
T42G
29.x.x.x.rom
29.83.0.10.rom
T41P
36.x.x.x.rom
36.83.0.10.rom
T40P
54.x.x.x.rom
54.83.0.10.rom
T40G
76.x.x.x.rom
76.83.0.10.rom
T29G
46.x.x.x.rom
46.83.0.10.rom
T27P
45.x.x.x.rom
45.83.0.10.rom

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries