CHAPTER13 Network
Mediant 1000 Gateway & E-SBC | User's Manual
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. 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 settings > nat-ip-addr).
➢ To configure a single static NAT IP address:
1. Open the Gateway General Settings page (Setup menu > Signaling & Media tab > Gateway
folder > Gateway General Settings).
2. In the 'NAT IP Address' field, enter the NAT IP address in dotted-decimal notation.
Figure 13-2: Configuring Static NAT IP Address
3. Click Apply.
The feature is applicable only to the Gateway application.
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 into NAT IP addresses (global -public) when the device is located
behind NAT. The device's NAT traversal mechanism replaces the source IP address of SIP
messages sent from a specific VoIP interface (Control and/or Media) in the IP Interfaces table to a
public IP address. This allows, for example, the separation of VoIP traffic between different ITSPs
and topology hiding of internal IP addresses from the “public” network. Each IP network interface
(configured in the IP Interfaces table) can be associated with a NAT rule, translating the source IP
address and port of the outgoing packet into the NAT address (IP address and port range).
The following procedure describes how to configure NAT translation rules through the Web
interface. You can also configure it through ini file [NATTranslation] or CLI (configure network
> nat-translation).
➢ To configure NAT translation rules:
1. Open the NAT Translation table (Setup menu > IP Network tab > Core Entities folder > NAT
Translation).
2. Click New; the following dialog box appears:
3. Configure a NAT translation rule according to the parameters described in the table below.
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