|1||Typical Network Example|
Configure an SBC Edge in a NAT Traversal Environment
In the left navigation pane, go to SIP > NAT Qualified Prefix Tables.
- Click the Create NAT Qualified Prefix Table Entry ( ) icon at the top of the SIP NAT Qualified Prefix Tables page.
- In the Description field, enter a description for the table (i.e., Default Private Prefixes).
- Click OK. The table is created.
- From the left navigation pane, click on the table just created.
- Click the Create NAT Qualified Prefix Table Entry ( ) icon at the top of the table.
- Configure the options. For field definitions, see Creating and Modifying a NAT Qualified Prefix Table.
|1||Create NAT Qualified Prefix Table|
Step 2: Associate NAT Qualified Prefix Table to Signaling Group
- Select the signaling group in which the NAT Qualified Prefix will be associated.
Access the Inbound NAT Traversal options.
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.
From the Detection drop down list, select Enable.
- 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.
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.
|1||Associate NAT Qualified Prefix Table to Signaling Group|
Guidelines/Recommendations for using NAT Traversal
We recommend that connecting NAT routers have SIP ALG disabled in order for NAT traversal to function properly.