Yealink T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
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static.sip.nat_turn.username = admin
Note: It works only if “static.sip.nat_turn.enable” is set to 1 (Enabled).
Permitted
Values
String
Default
Blank
Web UI
Network->NAT->TURN->User Name
Parameter
static.sip.nat_turn.password
[2]
<y0000000000xx>.cfg
Description
It configures the password to authenticate to the TURN (Traversal Using Relays around
NAT) server.
Example:
static.sip.nat_turn.password = yealink1105
Note: It works only if “static.sip.nat_turn.enable” is set to 1 (Enabled).
Permitted
Values
String
Default
Blank
Web UI
Network->NAT->TURN->Password
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for
T41P/T41S/T27P/T27G, X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2, X=1.
[2]
If you change this parameter, the IP phone will reboot to make the change take effect.
Keep Alive Configuration
Yealink IP phones can send keep-alive packets to the NAT device for keeping the communication port
open.
The following table lists the parameters you can use to configure keep alive.
Parameter
account.X.nat.udp_update_enable
[1]
<MAC>.cfg
Description
It configures the type of keep-alive packets sent by the IP phone to the NAT device to
keep the communication port open so that NAT can continue to function.
Permitted
Values
0-Disabled
1-Default (the IP phone sends UDP packets to the server).
2-Options (the IP phone sends SIP OPTIONS packets to the server).
3-Notify (the IP phone sends SIP NOTIFY packets to the server).
Default
1
Web UI
Account->Advanced->Keep Alive Type

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