LevelOne VOI-8001 - Manual (Page 62)

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4.2.5 Advance Setup
4.2.5.1 NAT Traversal
/VoIP Setup/Advance Setup/NAT Traversal
If your VoIP gateway is installed behind NAT, you may need a special
configuration and server to establish the VoIP communication, this gateway
support several method for NAT Traversal as below:
z By Outbound Proxy:
User can appoint an Outbound Proxy Server to handle the NAT traversal on
VoIP Setup/Register Sever/Server #/
z Declare NAT IP address:
Select to enable the input the NAT VoIP Gateway IP of the network.
z Use STUN server
Enable STUN and input the STUN server’s IP for handle the NAT traversal,
you can input 2 sets of STUN servers IP.
The Gateway will display the system found NAT IP address.
For store back to flash memory, please press Save Modification ( /System
Maintenance/Save Modification/ ).