En el driver del módem que yo probé, aquello lo hacían una serie de scripts que se instalaban tras instalar el driver.
Por favor, lee un poco:
readme.txt
Cita: 3. Automatic connection configuration
This version do not install automatic connection scripts because
of the many variants of Linux distributions and because of it's a matter
of taste as far as the manner to do that is concerned.
However, a sample script is given in the scripts/adsl directory.
This script is adsl.inittab and is writtent to be used directly in
the system configuration file /etc/inittab. To install it, you can
simply copy it to the /usr/sbin directory and add the following line
to your /etc/inittab file:
adsl:2345:respawn:/usr/sbin/adsl.inittab
This will start the connection automatically (and handle reconnections
as well) in the running level 2, 3, 4 and 5.
Note :
The install script do not handle USRobotics for now. The driver
is given with the BNM files for the DSP code of these modems, and with
the configuration files, as they are given by USRobotics. To use them
you must rebuild the binary DSP code file for you modem with the buildDSP
tool, and place the resulting file and the configuration files in the
/etc/analog directory.
Quizás si editas estos scripts con tus datos puedas conectar.
Un saludo,