problem with Conexant HSF softmodem (USB-0572:1300)

Hello,

I have a Conexant HSF softmodem (USB-0572:1300) that I'm trying to use 
with a Linux kernel 2.6.14.2.

 From my provider I have an OEM driver version 7.18.00.05oem. 
Unfortunetly, I have a compilation error:

CC [M]  /usr/lib/hsfmodem/modules/osusb.o
/usr/lib/hsfmodem/modules/osusb.c: In function `AbortListUrbs':
/usr/lib/hsfmodem/modules/osusb.c:236: error: `URB_ASYNC_UNLINK' 
undeclared (first use in this function)
/usr/lib/hsfmodem/modules/osusb.c:236: error: (Each undeclared 
identifier is reported only once
/usr/lib/hsfmodem/modules/osusb.c:236: error: for each function it 
appears in.)
/usr/lib/hsfmodem/modules/osusb.c: In function `FreeUrbList':
/usr/lib/hsfmodem/modules/osusb.c:257: error: `URB_ASYNC_UNLINK' 
undeclared (first use in this function)
/usr/lib/hsfmodem/modules/osusb.c: In function 
`cnxthsf_OsUsbMakeNotifyRequest':
/usr/lib/hsfmodem/modules/osusb.c:1498: error: `URB_ASYNC_UNLINK' 
undeclared (first use in this function)

So I donwloaded the latest driver on your website hsfmodem-7.18.07full 
to test it. The compilation works perfectly. However, only hsfsoar 
module could be loaded, other modules return an " -1 Unknown symbol in 
module".

Please let me know what i'm doing wrong or haw can solve this problem.
Thanks in advance for your help.

regards
-- 
Eric Santonacci / TALC Informatique