NeoGate TA410/810 User Manual
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than one IP address.
User Agent
To change the user agent parameter of asterisk, the default
is “NeoGate TA”; you canchange it if needed.
2) NAT
FigureIII-4-12 NAT Settings
Table III-4-9 Description of SIP General Settings
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.
External IP
The IP address that will be associated with outbound SIP message
s 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 isused with this system. Please
contact your ISP for more information.
External Refresh
Interval
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.
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