D-Link DI-308 - Manual (Page 43)

DI-308 ISDN Remote Router
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Dial Configuration
You can configure the two ISDN interfaces on your DI-308 to dial-out only when a
packet is forwarded to that interface, and hang up after all data has been transferred
and the link is idle. This can be used to lower the cost of an unpopular link or used
as a backup link to your ISP. This feature is commonly called “Dial on Demand.”
ISDN interfaces can also be configured here to receive calls from dial in users and
other networks, called “Remote Access.” Please note however, that in all cases, after
configuring the ISDN Links in the Dial Configuration submenu, they must be
further configured in the Dial-In User Profile submenu or Remote Network Profile
submenu.
Dial In IP Pool
The dial in IP pool allows you to define a range of IP addresses that will be reserved
for and assigned to dial-in users.