PLANET CS-2001 - Manual (Page 330)

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Step 12. Under Policy > Incoming, click New Entry and then set as below:
（Figure 11-128）
 Select the defined trunk from the VPN Trunk drop-down list.
 Click OK.
（Figure 11-129）
Figure 11-128 Configuring an Incoming Policy with VPN Trunk
Figure 11-129 An Incoming Policy with VPN Trunk