User's Manual 158 Document #: LTRT-10466
Mediant 500L MSBR
The figure below illustrates the NAT problem faced by the SIP networks where the device
is located behind a NAT:
Figure 15-9: Device behind NAT and NAT Issues
15.6.1.1 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.
The following procedure describes how to configure a static NAT address in the Web
interface. You can also configure this using the ini file parameter, StaticNATIP or CLI
command, configure voip > sip-definition general-settings > nat-ip-addr.
To configure a single static NAT IP address:
1. Open the SIP General Parameters page (Configuration tab > VoIP menu > SIP
Definitions > General Parameters).
Figure 15-10: 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, and then reset the device with a burn-to-flash for your settings to take
effect.
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