PLANET CS-2001 - Manual (Page 376)

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Step 10. Go to Policy > Outgoing, click New Entry and then set as below:
（Figure 11-245）
 Select the defined Trunk from the VPN Trunk drop-down list.
 Click OK.
（Figure 11-246）
Figure 11-245 Configuring an Outgoing Policy
Figure 11-246 Policy Completed