try this out.
if u have the sm56 driver installed as an rpm package then first type at the command line:
# depmod -a
then do the following.
# ln -sf /dev/ttyE0 /dev/modem
# mknod /dev/motomem c 28 0
then try out kppp. see that the device is ste to /dev/modem
and then query and see if it works. The rest should be easy.