ZyXEL Communications X2002, User Manual

Page: 145 / 562

Chapter 6 Server
X2002 User’s Guide
145
6.10 The Fake IP Screen
Use this screen to configure settings that may help you to avoid any potential VoIP
problems that result from having your X2002 behind a NAT router.
When enabled, the X2002 replaces the IP address inside all outgoing SIP packets
with the IP address of the upstream NAT router on your network. When the
packets get to their destination, the destination device can send its response to
the embedded address of the NAT router. The NAT router then forwards the
packets downstream to the X2002, which in turn sends them to the device on the
local end of the telephone conversation.
Note: This feature should be used if the NAT router does not utilize SIP ALG.
Click Configuration > PBX > Server Configuration > Server > Fake IP to
view the screen as shown next.
Figure 64 Server > Fake IP
Each field is described in the following table.
Table 30 Server > Fake IP
LABEL DESCRIPTION
Fake IP Select Disable to turn this feature off or Enable to turn it on.
By default, the Fake IP feature is disabled.
If you enable it, you must assign a value to the
Fake IP Setting field.
Fake IP Setting Enter the public IP address that the upstream NAT router uses to send
out the X2002’s SIP traffic. This is the IP address that will be inserted
into all outgoing SIP traffic.
Apply Click this to save your changes.
Reset Click this to set every field in this screen to its last-saved value.