NeoGate TB400 User Manual
www.yeastar.com
15
before timed out. Default is 20 seconds.
2) NAT
Note: Configuration of this section is only required when using remote
extensions.
·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 Address
Put down 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 be used 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
It’s 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:
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