PLANET CS-2001 - Manual (Page 347)

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Step 21. Under Policy > Incoming, click New Entry and then set as below:
（Figure11-168）
 Select the defined trunk for VPN Trunk.
 Click OK.
（Figure 11-169）
Figure 11-168 Configuring an Incoming Policy with VPN Trunk
Figure 11-169 An Incoming Policy with VPN Trunk Completed