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TB200/400 User Manual
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Table 4-9 Description of NAT Settings
Items Description
Enable STUN
STUN (Simple Traversal of UDP through NATs) is a protocol
for assisting devices behind a NAT firewall or router with
their packet routing.
STUN Address
The STUN server allows clients to find out their public
address, the type of NAT they are behind and the internet
side port associated by the NAT with a particular local port.
This information is used to set up UDP communication
between the client and the VOIP provider and so establish a
call.
STUN Port
STUN Port
External IP Address
The IP address that will be associated with outbound SIP
messages if the system is in a NAT environment.
External Host
Alternatively you can specify an external host, and the
system will perform DNS queries periodically.
This setting is only required when your public IP address is
not static. It is recommended that a static public IP address
issued with this system. Please contact your ISP for more
information.
External Refresh Interval
If an external host has been supplied, you may specify how
often the system will perform a DNS query on this host. This
value is specified in seconds.
Local Network Identification
Used to identify the local network using a network
number/subnet mask pair when the system is behind a NAT
or firewall.
Some examples of this are as follows:
“192.168.0.0/255.255.0.0”: All RFC 1918 addresses are
local networks;
“10.0.0.0/255.0.0.0”: Also RFC1918;
“172.16.0.0/12”:Another RFC1918 with CIDR notation;
“169.254.0.0/255.255.0.0”: Zero conf local network.
Please refer to RFC1918 for more information.
NAT Mode
Global NAT configuration for the system; the options for this
setting are as follows:
Yes = Use NAT. Ignore address information in the SIP/SDP
headers and reply to the sender’s IP address/port.
No = Use NAT mode only according to RFC3581.
Never = Never attempt NAT mode or RFC3581 support.
Route = Use NAT but do not include rport in headers.
Allow RTP Reinvite
By default, the system will route media steams from SIP
endpoints through itself. Enabling this option causes the
system to attempt to negotiate the endpoints to route
packets to each other directly, bypassing the system. It is