User`s manual

Version 5.4 73 May 2008
SIP User's Manual 3. Web-Based Management
Parameter Description
STUN is used to discover whether the device is located behind a NAT
and the type of NAT. In addition, it is 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. For detailed
information on STUN, refer to ''STUN'' on page 447.
Notes:
 For defining the STUN server domain name, use the ini file
parameter STUNServerDomainName (refer to ''Networking
Parameters'' on page 296).
 This parameter cannot be changed on-the-fly and requires a
device reset.
STUN Server Primary IP
[STUNServerPrimaryIP]
Defines the IP address of the primary STUN server.
The valid range is the legal IP addresses. The default value is 0.0.0.0.
STUN Server Secondary IP
[STUNServerSecondaryIP]
Defines the IP address of the secondary STUN server.
The valid range is the legal IP addresses. The default value is 0.0.0.0.
NFS Settings
NFS Table For detailed information on configuring the NFS table, refer to
''Configuring the NFS Settings'' on page 74.
DHCP Settings
Enable DHCP
[DHCPEnable]
Determines whether Dynamic Host Control Protocol (DHCP) is
enabled.
 [0] Disable = Disable DHCP support on the device (default).
 [1] Enable = Enable DHCP support on the device.
After the device powers up, it attempts to communicate with a BootP
server. If a BootP server does not respond and if DHCP is enabled,
then the device attempts to obtain its IP address and other networking
parameters from the DHCP server.
Notes:
 After you enable the DHCP server, perform the following
procedure:
1. Click the Submit button, and then save the configuration (refer
to ''Saving Configuration'' on page 265).
2. Perform a cold reset using the device's hardware reset button
(soft reset via Web interface doesn't trigger the BootP/DHCP
procedure and this parameter reverts to 'Disable').
 Throughout the DHCP procedure the BootP/TFTP application
must be deactivated, otherwise, the device receives a response
from the BootP server instead of from the DHCP server.
 For additional information on DHCP, refer to the Product
Reference Manual.
 DHCPEnable is a special 'Hidden' parameter. Once defined and
saved in flash memory, its assigned value doesn't revert to its
default even if the parameter doesn't appear in the ini file.