My ISDN connection uses an external usb device, as below. This has worked with FC2, with it referring to it as /dev/input/ttyACM0. If I understand correctly, I need to create a "rule" for it in /etc/udev/rules.d and call the file something like 20-udev.rules. However, I don't really understand what it should contain, and haven't made it recognise it as the device for my internet connection. could anyone help me with this? Thanks. Relevant section of /proc/bus/usb/devices T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0aca ProdID=1060 Rev= 0.11 S: Manufacturer=OPEN Networks Ltd S: Product=OPEN NT1 Plus II C:* #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=(none) E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=128ms I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none) E: Ad=02(O) Atr=02(Bulk) MxPS= 32 Ivl=0ms E: Ad=83(I) Atr=02(Bulk) MxPS= 32 Ivl=0ms DP South Australia