You first need to double-check that /dev/ttyS0 is actually the correct serial COM port you have the modem connected to.
Please look under System->Hardware and then click the 16550A-compatible COM port in the LH pane.
Then in the RH pane click on 'Advanced', and find the serial.device string or linux.device_file.
This will be something like:
linux.device_file strlist /dev/ttySx where x == 0|1|2|3 serial.device strlist /dev/ttySx where x == 0|1|2|3
Make sure this is the same as what you are trying to connect to.
Thank's Keith
I got it working
--- Michel Donais