AudioCodes Mediant 800B User Manual page 154

The figure below illustrates the NAT problem faced by the SIP networks where the device
is located behind a NAT:
12.10.1.1 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 through the Web
interface. You can also configure it through ini file (StaticNATIP) or CLI (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 12-10: 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.
12.10.1.2 Configuring NAT Translation per IP Interface
The NAT Translation table lets you configure up to 32 network address translation (NAT)
rules for translating source IP addresses per VoIP interface (SIP control and RTP media
traffic) into NAT IP addresses (global - public), when the device is located behind NAT. The
User's Manual
Figure 12-9: Device behind NAT and NAT Issues
154
Mediant 800B Gateway and E- SBC
Document #: LTRT-10296