Yealink SIP-T5 Series Administrator's Manual page 57

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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
It enables or disables the NAT traversal for a specific account.
Description
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).
0-Disabled
Permitted
1-STUN
Values
2-Manual NAT
Default 0
Web UI
Account > Register > NAT
Color Screen Phones:
Menu > Advanced (default password: admin) > Accounts > Account X > NAT Status
Phone UI 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
Description It enables or disables the manual NAT feature.
Permitted 0-Disabled
1-Enabled
Values
Default 0
Web UI Network > NAT > Manual NAT > Active
Parameter static.network.static_nat.addr
It configures the IP address to be advertised in SIP signaling.
Description 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
IP Address
Values
Default Blank
Web UI Network > NAT > Manual NAT > IP Address
Parameter static.sip.nat_stun.enable
Description It enables or disables the STUN (Simple Traversal of UDP over NATs) feature.
Permitted
0-Disabled
1-Enabled
Values
Default 0
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[1]
<MAC>.cfg
[2]
<y0000000000xx>.cfg
<y0000000000xx>.cfg
<y0000000000xx>.cfg