Yealink VC400 Administrator's Manual page 97

Multiple solutions for NAT traversal are available, for example, application layer gateway (ALG),
simple traversal of UDP through NAT (STUN), and H.460 firewall traversal.
Static NAT
If NAT/Firewall devices do not support the ALG. VC400/VC120 must be configured with the
static NAT.
Static NAT defines a one-to-one mapping from one IP subnet to another IP subnet. The
mapping includes destination IP address translation in one direction and source IP address
translation in the reverse direction. From the NAT device, the original destination address is the
virtual host IP address while the mapped-to address is the real host IP address.
If your system is connected to a LAN that uses a NAT, you need to configure NAT Public IP
Address so that your system can communicate to WAN.
If H.460 firewall traversal is enabled on the system, the system will automatically ignore the static
Note
NAT settings for H.323 calls. For more information on H.460 firewall traversal, refer to
Firewall Traversal
Static NAT feature parameters on the system are described below:
Parameter
Static NAT
NAT Public IP
on page 91.
Description
Specifies the static NAT type.
Disabled—the system does not

use the NAT feature.
Manual—the system uses the

manually configured NAT
public address.
Auto—the system obtains the

NAT public address from the
Yealink-supplied server.
Default: Disabled
Displays the NAT public

Configuring Network
H.460
Configuration Method
Remote Control
Web User Interface
Remote Control
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