PLANET CS-2001 - Manual (Page 354)

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Step 20. Under Policy > Outgoing, click New Entry and then set as below:
（Figure 11-190）
 Select the defined trunk for VPN Trunk.
 Click OK.
（Figure 11-191）
Figure 11-190 Using VPN Trunk in an Outgoing Policy
Figure 11-191 An Outgoing Policy with VPN Trunk