Yealink SIP-T31G Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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Yealink phones support three NAT traversal techniques: manual NAT, STUN and ICE. If you enable manual NAT
and STUN, the phone will use the manually-configured external IP address for NAT traversal. The TURN protocol is
used as part of the ICE approach to NAT traversal.
The following table lists the parameters you can use to configure NAT traversal.
Parameter
account.X.nat.nat_traversal
[1]
<MAC>.cfg
Description
It enables or disables the NAT traversal for a specific account.
Note: If it is set to 1 (STUN), it works only if “static.sip.nat_stun.enable” is set to 1 (Enabled); if it is set
to 2 (Manual NAT), it works only if “static.network.static_nat.enable” is set to 1 (Enabled).
Permitted
Values
0-Disabled
1-STUN
2-Manual NAT
Default
0
Web UI
Account > Register > NAT
Phone UI
Color Screen Phones:
Menu > Advanced (default password: admin) > Accounts > Account X > NAT Status
Black-and-white Screen Phones:
Menu > Settings > Advanced Settings (default password: admin) > Accounts > AccountX > NAT Status
Note: Manual NAT cannot be configured via the phone user interface.
Parameter
static.network.static_nat.enable
[2]
<y0000000000xx>.cfg
Description
It enables or disables the manual NAT feature.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Web UI
Network > NAT > Manual NAT > Active
Parameter
static.network.static_nat.addr <y0000000000xx>.cfg
Description
It configures the IP address to be advertised in SIP signaling.
It should match the external IP address used by the NAT device.
Note: It works only if “static.network.static_nat.enable” is set to 1 (Enabled).
Permitted
Values
IP Address
Default
Blank
Web UI
Network > NAT > Manual NAT > IP Address
Parameter
static.sip.nat_stun.enable <y0000000000xx>.cfg
Description
It enables or disables the STUN (Simple Traversal of UDP over NATs) feature.
Permitted
Values
0-Disabled
1-Enabled
Default
0

Yealink SIP-T31G Specifications

General

Mounting kit	Yes
Number of handles included	1 pc(s)
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	G.722, G.729, AGC, G.729A, AJB, PLC, G.711Mu, VAD, G.711a, G.723.1, G.726, iLBC, CNG, OPUS
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	3 W
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Sustainability certificates	RoHS, REACH
Networking standards	IEEE 802.3af, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	188 mm
Height	162 mm
Package depth	210 mm
Package width	213 mm
Package height	103 mm