Firewall Traversal; Signaling Nat Traversal - DBL Technology HT-912T User Manual

3.3.3.4. Firewall Traversal

In the advanced configuration of call settings, signal and media each has
firewall configuration.
3.3.3.4.1. H.323 Signaling NAT Traversal
There are four styles as follows:
A） None
Select None to turn off this feature.
B) Nat Citron
Citron is a dedicated firewall penetration agreement for GNUGK.
C) Port Transparent/DMZ
Port Transparent refers that put network port of the LAN into computer or inside of
the LAN. The actual servers allow external users enjoy the servers of internal
server(FTP、HTTP、Telnet) .
Port Transparent includes the Gateway address and response server address.
Gateway is communications equipment that connect two different networks,
response to the server is standard service equipment that perform ECHO protocol.
D）Relay proxy
Relay proxy is a proprietary NAT traversal technology.
server address, port, username, and password.
Relay proxy makes encryption on the Gateway's communication, this function need
the support of DBL. technology.
It includes relay proxy