PLANET CS-2001 - Manual (Page 407)

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Step 5. Go to Policy > Incoming, click New Entry and then set as below:
（Figure
11-289）
 Select the defined Trunk from the VPN Trunk drop-down list.
 Click OK.
（Figure 11-290）
Figure 11-289 Configuring an Incoming Policy with VPN Trunk
Figure 11-290 Setting Completed