PLANET CS-2001 - Manual (Page 329)

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Step 11. Under Policy > Outgoing, click New Entry and then set as below:
（Figure 11-126）
 Select the defined trunk from the VPN Trunk drop-down list.
 Click OK.
（Figure 11-127）
Figure 11-126 Configuring an Outgoing Policy with VPN Trunk
Figure 11-127 An Outgoing Policy with VPN Trunk