User manual

http://www.DBL.com FXS+FXO Gateway Series

3.3.3.4.3. Media NAT Traversal

Similar to Signaling NAT Traversal, this feature allows media packets (RTP) to be routed

properly in various network environments.

A）NONE

Select None to disable this feature.

B) 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).It contains Gateway address and the responding to the server's address.

Gateway is communications equipment that connect two different networks, response to the

server is standard service equipment that perform ECHO protocol.

C）STUN(RFC3489)

STUN (Simple Traversal of UDP (User Datagram Protocol) through NATS (Network

Address Translators)) is a network protocol allowing a client behind a NAT (or multiple

NATS) to find out its public address, the type of NAT it is behind and the internet-side port

associated by the NAT with a particular local port.

Select STUN (RFC 3489) to use a STUN server for Signaling NAT Traversal. Enter the IP

Address or the domain name of the STUN server to be used.

D） Relay Proxy

Relay proxy is a proprietary NAT traversal technology. Please consult your service

provider for more information.

Currently, the following 3 kinds of packaging mechanism are supported:

¾ Mode 1: The media uses UDP packets and (or) encrypt with multiple UDP port;

¾ Mode 2: The media uses UDP packets and (or) encrypt with single UDP port;

¾ Mode 3: The media uses TCP packets and (or) encrypt (UDP over TCP).