AudioCodes Mediant 3000, User Manual

Page: 140 / 872

User's Manual 140 Document #: LTRT-89729
Mediant 3000
11.9.1.3 Configuring NAT Translation per IP Interface
The NAT Translation table defines 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 Multiple
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.
Note: The NAT Translation table can also be configured using the table ini file
parameter, NATTranslation.

To configure NAT translation rules:
1. Open the NAT Translation Table page ( Configuration tab > VoIP menu > Control
Network submenu > NAT Translation Table ).
2. Click the Add button; the following dialog box appears:
Figure 11-13: NAT Translation Table Page
3. Configure the parameters as required. For a description of the parameters, see the
table below:
4. Click Submit to apply your changes.
5. To save the changes to flash memory, see 'Saving Configuration' on page 520 .
NAT Translation Table Parameters
Parameter Description
Index
[NATTranslation_Ind
ex]
Defines the table index entry. This table can include up to 32 entries.