User manual

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

3.3.3.4.2. SIP Signaling NAT Traversal

SIP Signaling NAT Traversal has 3 kinds:

A) None

Select None to disable this feature.

B) STUN （RFC 3489）

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.

C) Relay Proxy

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

provider for more information. It includes relay proxy server address, port, username, and

password.

Relay proxy makes encryption on the Gateway’s communication, this function need the

support of DBL. technology.

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