This article is from the Windows NT Internet FAQ, by email@example.com (Steve Scoggins) with numerous contributions by others.
Thanks to Tom Horsley (Tom.Horsley@mail.csd.harris.com) for his
suggestion of configuring PPP from the Rasphone.
Instead of configuring PPP starting from the Network entry on the
control panel, I find that I can configure those details
from the RAS program's phonebook in the Advanced edit dialog. This
actually makes perfect sense because the details are likely to be
different for each phone number.
For PPP you can configure the TCP/IP settings as follows:
Double click on the Remote Access icon.
Highlight the proper entry then click on the EDIT button.
Click on Advanced if set to Basic.
Click on Network button (Displays the Network Protocol Settings Dialog)
Check the PPP option.
Click on TCP/IP Settings
If using dynamic IP addresses, check "Use server assigned IP addresses".
If using a static IP address, check "Require specific IP address" and
fill in your assigned address.
and enter the primary and backup DNS IP addresses. The
backup DNS is optional.
If your provider supports compressed ppp, check Use VJ compression.
and also check the use default gateway on remote network.