User's Manual 148 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
12.7.1.2 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
device's NAT traversal mechanism replaces the source IP address of SIP messages sent
from a specified VoIP interface 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:
Figure 12-7: NAT Translation Table - Dialog Box
3. Configure a NAT translation rule according to the parameters described in the table
below.
4. Click Apply, and then save your settings to flash memory.
Table 12-15: NAT Translation Table Parameter Descriptions
Parameter Description
Source
Index
index
[NATTranslation_Index]
Defines an index number for the new table row.
Note: Each row must be configured with a unique index.
Source Interface
src-interface-name
[NATTranslation_SrcIPInterfaceName]
Assigns an IP network interface (configured in the IP
Interfaces table) to the rule. Outgoing packets sent from the
specified network interface are NAT'ed.
By default, no value is defined.
To configure IP network interfaces, see ''Configuring IP
Network Interfaces'' on page 135.
Source Start Port
src-start-port
Defines the optional starting port range (1-65536) of the IP
interface, used as matching criteria for the NAT rule. If not
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