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This Best Practice describes how NAT Traversal is enabled and configured within the

Overview - What is NAT Traversal?

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1. In the left navigation pane, go to SIP > NAT Qualified Prefix Tables.
   
   

2. Click the Create NAT Qualified Prefix Table Entry ( Image RemovedImage Added) icon at the top of the SIP NAT Qualified Prefix Tables page.
   
   
3. In the Description field, enter a description for the table (i.e., Default Private Prefixes).
   
   
4. Click OK. The table is created.
   
   
5. From the left navigation pane, click on the table just created.
   
   
6. Click the Create NAT Qualified Prefix Table Entry ( Image Removed Image Added) icon at the top of the table.
   
   
7. Configure the options. For field definitions, see Creating and Modifying a NAT Qualified Prefix Table.
   
   

8. Click Apply.

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   Caption 0 Figure 1 Create NAT Qualified Prefix Table

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1. Select the signaling group in which the NAT Qualified Prefix will be associated.
   
   

2. Access the Inbound NAT Traversal options.

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   Do not confuse the Inbound NAT Traversal fields with the Outbound NAT Traversal fields in the SIP IP Details section. The Outbound NAT Traversal fields are used when the SBC is on the private side of a NAT device.

3. From the Detection drop down list, select Enable.
   
   

4. From the Qualified Prefixes Table drop down list, select the applicable table you created in Step 1. When examining SIP packets, this table determines which Subnets should be treated as being behind a NAT device.
   
   

5. Configure optional fields (i.e, Secure Media Latching, Secure Media Netmask and Registrar Max. TTL Enabled). For field definitions, see Creating and Modifying SIP Signaling Groups.

6. Click Apply.

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   Caption 0 Figure 1 Associate NAT Qualified Prefix Table to Signaling Group

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Guidelines/Recommendations for using NAT Traversal

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