What is DTR?
It is the name of one of the pins in the RS-232 connector -- Data Terminal Ready. If you are using hardware flow control, the Modem might expect to see a true signal on this pin.
And why does my debian dialing tool work? This makes a /usr/sbin/pppd call $PROVIDER where $PROVIDER is a file in /etc/ppp/peers and looks like that: -----<snip>----- hide-password noauth connect "/usr/sbin/chat -v -f /etc/chatscripts/1und1" debug /dev/modem 230400 defaultroute noipdefault user "1und1/XXXXXXXXXXXXXX@xxxxxxxxx" remotename 1und1 ipparam 1und1 -----<snip>-----
The PPP script probably works because it is slightly different than the script that KPPP uses. You can edit the script in KPPP to match and see if that works.
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