Sometime Today, DSKRP cobbled together some glyphs to say:
--> Re-Sending: ATZ --> Modem not responding.
this suggests that the modem prolly isn't on that port.
[Modem0] Modem = /dev/ttyS0
Try changing to /dev/ttyS1 and see what happens.
do you by any chance have your bios set to deal with a plug and play OS and have COM port resources set to Auto?
I've noticed this before. The resources of the COM ports change automatically at startup time. Specify static IRQ, and IO ports for your COM ports and they should work.