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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 Hybertone
Technology. It enables the products of Hybertone 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
”
).
Note: This feature needs the support of the server developed by Hybertone Technology.
3.5.6.2 Traversal of SIP Signaling over NAT
The traversal of SIP signaling over NAT (firewall) is classified into:
A. No