Don't worry! It's only stuff...

#!/bin/bash
 
# get pci id (for example avm isdn card)
lspci | grep AVM | cut -d " " -f1
 
# hide device in DomO
vi /boot/grub/menu.lst
pciback.permissive pciback.hide=(05:00.0)(01:07.0)
 
# add device to DomU
vi /etc/xen/fax
pci=['05:00.0,01:07.0']
 
# USB
# to delegate USB devices you need to delegate the PCI USB controller to the DomU
 
# LINK
# http://www.neobiker.de/wiki/index.php?title=USB_in_DomU