Yealink VC400, Administrator'S Manual

Page: 97 / 299

Configuring Network
81
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.
Note
Static NAT feature parameters on the system are described below:
Parameter Description Configuration Method
Static NAT
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
Remote Control
Web User Interface
NAT Public IP

Displays the NAT public
Remote Control
If H.460 firewall traversal is enabled on the system, the system will automatically ignore the static
NAT settings for H.323 calls. For more information on H.460 firewall traversal, refer to
H.460
Firewall Traversal on page 91 .