I got it.. I changed the ATZ to ATX3, and increased the Post- and Pre-init values, and now it atleast gets a little further.. Now I've got a new problem.
The new problem happens after;

ATDT(NUMB)
CONNECT 57600

And below that there's: Starting pppd...
Suddenly this errormessage pops up:

The pppd daemon died unexpectedly!
Exit status: 2

Then I pressed Details, and this is what i found there:

Code:
Cannot open any of the following logfiles:
/var/log/syslog.ppp
/var/log/syslog
/var/log/messages
What should i do now?