> dial-out number(HPUX), It coundn't work. Do you have any idea why and how to
> fix it? What are the possible areas I should look into.

        This is like saying, "My car doesn't work.  Do you have any idea
why and how to fix it?"  A computer is a fairly complicated system, and
there could be any number of reasons it's not working (or maybe it is?).

        Troubleshoot the problem--do you hear the modems connecting?  Open
up a terminal window and type (as root)

tail -f /var/log/messages

        ...and see what messages appear.

        If you hear the modems connecting, then wait 10 seconds after the
connect and then type "ifconfig" and see if you have a network device
titled "ppp".

        If you do have a ppp device, trying pinging the IP address of your
HPUX to see if it comes back.  It could be that your DNS is the only thing
not working.

--Derek

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