Unable to establish dialup connection with ISP

Every time I try to establish a dialup connection with my ISP I get an error
720, which supposedly has to do with TCP-IP issues, and the connection
drops.

I have spent an hour on the phone with the ISP and another hour with
Microsoft--there seems to be no solution. We have reset Winsock, done
everything Microsoft suggests in the KB, reinstalled SP2, gone through all
the usual and unusual IP and TCP maneuvers, and I've done exhaustive
searching of the Internet on this.

I've gotten rid of all other known drivers for other modems and updated the
driver on this one, a Lucent Winmodem.

I've even switched modems between two computers, and the modem that was
working on dialup to my ISP on the other computer doesn't work on mine for
dialup to the ISP. I have no problem using either modem (both old Lucent
Winmodems) on either computer for faxes.

I ran a modem log, and the seemingly relevant lines are these:

From these three lines,

04-06-2006 22:47:00.126 - Hanging up the modem.
04-06-2006 22:47:00.126 - Hardware hangup by lowering DTR.
04-06-2006 22:47:00.626 - Detected CD dropped from lowering DTR

and from searching on this response, it seems to be either a line problem,
modem problem, or a problem with the ISP and signal strength. The line seems
to be OK. I've switched phone lines at home, as well--no help. And the other
computer works fine on the same line, same connection, as I am using with
the computer that doesn't work., although the other computer connects at
38.5.

I've tried adding init commands to force a connection at a loer speed--no
help.

I'm wondering if there is some way I can delete the registry settings for
dialup--wherever they are--on the computer that won't connect, and then
doing an export-import export from the computer that works to the computer
that doesn't. I wouldn't know how to do this without instructions.

This is a single cross-post after not getting the answer on the XP-General
forum.

Thanks.

Ken





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