Yealink T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
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For the phone with MAC 001565b09d886, it will download the 001565b09d886.boot file, and then
download Linekey.cfg and 001565b09d886.cfg files referenced in the 001565b09d886.boot file in
sequence from the provisioning server.
For the IP phones except MAC-specific phone, they will request to download the y000000000000.boot
file, and then request to download the referenced files. The phone-specific configuration file Linekey.cfg
only applies to T46S and T48S IP phones. The only difference is that T46S and T48S IP phones will
download both the two files, since the exclude mode is disabled by default. The other IP phones will only
download the CustomSettings.cfg file.
For the parameter settings in the CustomSettings.cfg file, the phone-specific parameters will only take
effect on the specific phone models.
The following shows provisioning flowchart for different phone models with phone-specific settings.

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