[root@root]# service isdn start
Using your settings
io=0,0 irq=7 protocol=3,3 type=3,3 id=hst%echo
Loading ISDN Device Drivers ...
Using /lib/modules/2.4.20-8/kernel/drivers/net/slhc.o
insmod: a module named slhc already exists
Using /lib/modules/2.4.20-8/kernel/drivers/isdn/isdn.o
insmod: a module named isdn already exists
Using /lib/modules/2.4.20-8/kernel/drivers/isdn/hisax/hisax.o
/lib/modules/2.4.20-8/kernel/drivers/isdn/hisax/hisax.o: init_module: No such device
Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters.
      You may find more information in syslog or the output from dmesg
Enable HiSax D-Channel logging ...
/dev/isdnctrl: No such device
/dev/isdnctrl: No such device
Starting isdnlog with /etc/isdn/isdnlog.isdnctrl0.options on /dev/isdnctrl ...
Configure INTERFACES in /etc/isdn/isdn.conf ...
Can't open /dev/isdnctrl or /dev/isdn/isdnctrl: No such device
ERROR! Starting of ipppd FAILED!