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I am using redhat 6.1, trying to config ppp using wvdial, under windows my modem port is com2 (Rockwell 56k) so using modemtool I have /dev/ttyS1 > com2 At first I got error msg in /var/log/messages "cannot locate terminal parameters: input/output error", so I setserial /dev/ttyS1 port 0x02f8 irq 4, this error msg no longer appears, however I get modem not responding after AT&F init string is sent. I have upgraded my initscript and ppp-2.3.10.3 I hope this is enough info can anyone help!!
Is your modem a "WinModem" or a modem "for Windows"? If so, it will not work under other operating systems unless the manufacturer writes a driver for it.
Normally 0x2f8 (ttyS1) is irq 3 standard and optionally irq 5. irq 4 is reserved for 0x3f8 (ttyS0) so this will probably not work anyway. If you go into windows and look at the resources under system manager that com2 is using, what is the irq it is reporting? Once you know that you should be able to do setserial 0x2f8 irq (number from windows) and get it to work.
Closing due to inactivity. Reopen, if the problem is still existing.