User's Manual 508 Document #: LTRT-68822
Mediant 2000
45.1.5 NAT and STUN Parameters
The Network Address Translation (NAT) and Simple Traversal of UDP through NAT
(STUN) parameters are described in the table below.
NAT and STUN Parameters
Parameter Description
STUN Parameters
Web: Enable STUN
EMS: STUN Enable
[EnableSTUN]
Enables Simple Traversal of UDP through NATs (STUN).
 [0] Disable (default)
 [1] Enable
When enabled, the device functions as a STUN client and
communicates with a STUN server located in the public Internet. STUN
is used to discover whether the device is located behind a NAT and the
type of NAT. It is also used to determine the IP addresses and port
numbers that the NAT assigns to outgoing signaling messages (using
SIP) and media streams (using RTP, RTCP and T.38). STUN works
with many existing NAT types and does not require any special
behavior from them.
Notes:
 For this parameter to take effect, a device reset is required.
 For defining the STUN server domain name, use the parameter
STUNServerDomainName.
 For more information on STUN, see Configuring STUN on page 126.
Web: STUN Server
Primary IP
EMS: Primary Server IP
[STUNServerPrimaryIP]
Defines the IP address of the primary STUN server.
The valid range is the legal IP addresses. The default is 0.0.0.0.
Note: For this parameter to take effect, a device reset is required.
Web: STUN Server
Secondary IP
EMS: Secondary Server
IP
[STUNServerSecondaryI
P]
Defines the IP address of the secondary STUN server.
The valid range is the legal IP addresses. The default is 0.0.0.0.
Note: For this parameter to take effect, a device reset is required.
[STUNServerDomainNa
me]
Defines the domain name for the Simple Traversal of User Datagram
Protocol (STUN) server's address (used for retrieving all STUN servers
with an SRV query). The STUN client can perform the required SRV
query to resolve this domain name to an IP address and port, sort the
server list, and use the servers according to the sorted list.
Notes:
 For this parameter to take effect, a device reset is required.
 Use either the STUNServerPrimaryIP or the
STUNServerDomainName parameter, with priority to the first one.
NAT Parameters
Web/EMS: NAT Traversal
[DisableNAT]
Enables the NAT mechanism. For more information, see 'First Incoming
Packet Mechanism' on page 129.
 [0] Enable
 [1] Disable (default)
Web: NAT IP Address
EMS: Static NAT IP
Defines the global (public) IP address of the device to enable static NAT
between the device and the Internet.
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