>To do what you're trying, I'd suggest running dt. In one window type
>"cat /dev/tty00" In another window, type "stty -f /dev/tty00 clocal".
>The latter command will disable the "wait for carrier" attribute. The
>first command will keep the tty open so settings will stick (they get
>reset to the defaults  when the tty goes from closed to open).

This is why I suggested you try to chat with your modem using cu.
Try this:
     cu -l /dev/tty00 -s 19200

After it says connected, see if you can't dialog with your modem.
Might be better to do this in a dt virtual console.

Paul