User manual

得伯乐科技有限公司
DBL Technology Limited GoIP User Manual
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A. No
The mechanism of firewall traversal is not supported.
B. Nat Citron
The Citron is a special firewall traversal protocol for GnuGK and used with GnuGK.
C. Port Transparency/DMZ
The port transparency is used to transfer the network port on the LAN interface to the computer
or the server in the LAN. This feature enables external users (through the Internet in most cases) to
share the services of internal servers (such as FTP, HTTP, and Telnet).
The port transparency supports the address of the gateway and response server. The gateway is a
communication device that connects two different networks. The response server is a standard service
device that implements the ECHO protocol.
D. Trunk Agent
The trunk agent protocol is a firewall traversal technology developed by DBL Technology. It
enables the products of DBL Technology to be applicable for most LANs. It involves the address of
the trunk proxy server, port, user name and password.
The trunk agent protocol supports encryption on communications over the gateway. The H323
trunk agent protocol supports encryption on signaling in different modes (for details about the agent
mode, see section 3.5.6.3 “Media NAT Traversal”).