D-Link DVX-2002F User Manual page 100

Enable: Tick the checkbox to enable IPSec VPN server.
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Type:Defaults toTunnel mode.
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IPSec Local IP: DVX WAN IP, which can be used to connect to the client network.
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IPSec Password: Define a password for authentication of the IPSec client.
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IPSec Remote IP: IPSec VPN client IP.The client uses this IP to connect to IPSec server.
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IPSec Remote Network:Specify the IPSec VPN client LAN network address.
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Notice:
1.If the DVX IPPBX is behind NAT, port 500 and 4500 must be open on the router/firewall.
2.If the DVX IPPBX is connected to the Internet via PPPoE, then IPSec Local IP needs to be the IP address assigned
by PPPoE.
3.IPSec VPN server can connect 3 IPSec clients.
IPSec VPN Client (Tunnel mode)
On the remote site, open the web GUI of another DVX IPPBX system and navigate to web menu
ClientNetwork Settings->VPN
to configure the VPN
On the VPN Client page choose IPSec and tick "Enable" option to enable IPSec client.
Client.
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DVX IPPBX