 To enable STUN:
1. Open the Application Settings page (Configuration tab > System menu >
Application Settings).
Figure 11-11: STUN Parameters in Application Settings Page
2. From the 'Enable STUN' (EnableSTUN) drop-down list, select Enable to enable the
STUN feature.
3. Configure the STUN server address using one of the following methods:
• Define the IP address of the primary and secondary (optional) STUN servers,
using the 'STUN Server Primary IP' field (STUNServerPrimaryIP) and 'STUN
Server Secondary IP' field. If the primary STUN server is unavailable, the device
attempts to communicate with the second server.
• Define the domain name of the STUN server using the ini file parameter,
STUNServerDomainName. The STUN client retrieves all STUN servers with an
SRV query to resolve this domain name to an IP address and port, sorts the
server list, and uses the servers according to the sorted list.
4. Configure the default NAT binding lifetime (in secondsUse) using the ini file
parameter, NATBindingDefaultTimeout. STUN refreshes the binding information after
this time expires.
11.8.1.2 Configuring a Static NAT IP Address for All Interfaces
You can configure a global (public) IP address of the router to enable static NAT between
the device and the Internet for all network interfaces. Thus, the device replaces the source
IP address for media of all outgoing SIP messages sent on any of its network interfaces to
this public IP address.
Note: The NAT IP address can also be configured using the ini file parameter,
StaticNATIP.
 To configure a single static NAT IP address for all interfaces:
1. Open the SIP General Parameters page (Configuration tab > VoIP menu > SIP
Definitions submenu > General Parameters).
Figure 11-12: Configuring Static NAT IP Address in SIP General Parameters Page
2. In the 'NAT IP Address' field, enter the NAT IP address in dotted-decimal notation.
3. Click Submit.
4. Save the setting to the device's flash memory with a device reset (see 'Saving
Configuration' on page 324).
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