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DVG-5112S User's Manual
3-2-4-2 NAT Traversal
If your VoIP TA is set up behind an Internet sharing device, you can select either the NAT or STUN
protocol.
ADVANCED → Advanced Network → NAT Traversal
Enable NAT Public IP: Check the box to use the IP address of the Internet sharing device if the VoIP TA is
set up behind an Internet sharing device. Also the VoIP TA will use the IP address of the Internet sharing
device as the public IP when it connects to Internet. Furthermore, some of the Internet sharing device's type
is symmetric NAT. You need to set Virtual Server or Port Mapping (Forwarding) from the Internet sharing
device for the listen port and communication ports (RTP ports) of the VoIP TA.
NAT IP/Domain: Enter the real public IP address of the IP sharing device or the router; or enter a true URL
(Uniform Resource Locator) when DDNS is used. Please refer to the DDNS settings.
Note: If you are setting a public IP in this field, it has to be a static public IP, otherwise VoIP communication
may not be established properly. Please contact your ISP to check if your Internet connection has static
public IP addresses.
Enable STUN Client: Check the box to use the STUN protocol prevents problems from setting the IP
sharing function. (Some NATs do not support this protocol.)
Note: You can use the "Status
device. If the NAT type is "Symmetric NAT," then the VoIP TA is not able to traverse the NAT. It is not a flaw
of the VoIP TA design, but rather a limitation of the STUN protocol.
STUN Server IP/Domain and Port: Enter the IP address and listen port of the STUN server. You can set
two STUN server IPs separated by a semicolon.
Enable UPnP Control Point: Check the box to enable the VoIP TA's IP traffic to pass through an Internet
sharing device. This function only works when the Internet sharing device supports UPnP and has it
enabled.
Note: The "Status
D-Link Systems, Inc.
STUN Inquiry" page to detect the NAT type of your Internet sharing
Current Status" page will show the status of UPnP.
ADVANCED
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