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1b1ed1a
(Get the code!)
are you sure the modem is awake (as in, no software magic or no bios needs to wake it up)?
that modem has firmware that can be updated; do you have the latest?
what happens if you send a regular hayes command to the modem, for example: escape, speaker always on, volume up and a pause (to hear a line)?
$ echo '+++'>/dev/ttyS4
$ echo ATM2L3>/dev/ttyS4
$ echo ATD>/dev/ttyS4
do you now hear a dialtone (i am assuming it has a speaker)?
it's a usrobotics; i remember these had a slightly different command stack in the eighties and the nineties. but it should take standard hayes command nevertheless. the usr.com page doens't list a datasheet...
from your dmesg:
> [ 1.365228] 0000:04:01.0: ttyS4 at I/O 0xd000 (irq = 17) is a 16550A
this looks like a serial port, not like a fax/modem. do you have anything else in your dmesg that points to a modem? what does lspci tells you? try "sudo lspci -vvvk" and see if the modem is listed
to post the traces: they should be written to files automatically, just post these as attachments? make sure you do a trace of your problem (sending a fax):