DBL Technology HT-842R, Руководство пользователя

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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.