Draytek VigorIPPBX 2820 Series, User Manual

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VigorIPPBX 2820 Series User’s Guide 253
Allowed Dial-In Type Determine the dial-in connection with different types.
ISDN Allow the remote ISDN LAN-to-LAN connection. You
should set the User Name and Password of remote dial-in
user below. In addition, you can further set up Callback
function below.
PPTP
Allow the remote dial-in user to make a PPTP VPN
connection through the Internet. You should set the User
Name and Password of remote dial-in user below.
IPSec Tunnel Allow the remote dial-in user to trigger an IPSec VPN
connection through Internet.
L2TP Allow the remote dial-in user to make a L2TP VPN
connection through the Internet. You can select to use
L2TP alone or with IPSec. Select from below:
None - Do not apply the IPSec policy. Accordingly, the
VPN connection employed the L2TP without IPSec policy
can be viewed as one pure L2TP connection.
Nice to Have - Apply the IPSec policy first, if it is
applicable during negotiation. Otherwise, the dial-in VPN
connection becomes one pure L2TP connection.