Yealink T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
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IP Phone Model
Firmware Name
Example
T27G
69.x.x.x.rom
69.83.0.10.rom
T23P/G
44.x.x.x.rom
44.83.0.10.rom
T21(P) E2
52.x.x.x.rom
52.83.0.10.rom
T19(P) E2
53.x.x.x.rom
53.83.0.10.rom
Firmware Upgrade Configuration
Before upgrading firmware, you need to know the following:
 Do not close and refresh the browser when the IP phone is upgrading firmware via web user
interface.
 Do not unplug the network cables and power cables when the IP phone is upgrading firmware.
The following table lists the parameters you can use to upgrade firmware.
Parameter
static.firmware.url
[1]
<y0000000000xx>.cfg
Description
It configures the access URL of the firmware file.
Example:
static.firmware.url = http://192.168.1.20/44.81.0.15.rom
Permitted
Values
URL within 511 characters
Default
Blank
Web UI
Settings->Upgrade->Select And Upgrade Firmware
[1]
If you change this parameter, the IP phone will reboot to make the change take effect.

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