Hello, Can You started such configuration -> Asterisk+HiSax(module)+PCI 128 ISDN card (winbound chipset) ?? Any sugestion ?? I have: HiSax: Linux Driver for passive ISDN cards HiSax: Version 3.5 (module) HiSax: Layer1 Revision 2.46.2.5 HiSax: Layer2 Revision 2.30.2.4 HiSax: TeiMgr Revision 2.20.2.3 HiSax: Layer3 Revision 2.22.2.3 HiSax: LinkLayer Revision 2.59.2.4 kernel 2.6.16.22 Additionaly I haven't /dev/ttyI0 and /dev/ttyI1 [root@srv-asterisk ~]# ls /dev/ttyI* ls: /dev/ttyI*: No such file or directory Maybe better I resign from HiSax and will install mISDN ?? Regards Tomek