Configuring Nat Translation Per Ip Interface - AudioCodes Mediant 1000B User Manual

User's Manual
12.11.1.2

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 or public), when the device is located behind NAT.
This allows, for example, the separation of VoIP traffic between different ITSP's, and
topology hiding of internal IP addresses to the "public" network. Each IP interface
(configured in the Interface table) can be associated with a NAT rule in this table,
translating the source IP address and port of the outgoing packet into the NAT address (IP
address and port range). 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.
The following procedure describes how to configure NAT translation rules in the Web
interface. You can also configure Bandwidth Profiles using the table ini file parameter,
NATTranslation or CLI command, voip-network NATTranslation.

To configure NAT translation rules:
1. Open the NAT Translation Table page (Configuration tab > VoIP menu > VoIP
Network > NAT Translation Table).
2. Click Add; the following dialog box appears:
3. Configure a NAT translation rule according to the parameters described in the table
below.
4. Click Submit, and then save ("burn") your settings to flash memory.
Table 12-21: NAT Translation Table Parameter Descriptions
Parameter
Index
CLI: index
[NATTranslation_Index]
Source Interface Name
CLI: SourceIPInterfaceName
[NATTranslation_SourceIPInterfaceName]
Target IP Address
CLI: TargetIPAddress
[NATTranslation_TargetIPAddress]
Version 6.8
Figure 12-15: NAT Translation Table Page
Defines an index number for the new table record.
Note: Each table row must be configured with a
unique index.
Defines the name of the IP interface, as configured in
the Interface table.
Defines the global IP address. This address is set in
the SIP Via and Contact headers as well as in the o=
and c= SDP fields.
137
Description
Mediant 1000B Gateway & SBC
12. Network