Anybody uses it? My provider offers me that option at no extra charge only I can't seem to get it working. When I try to tell isdnctrl to create a slave interface for ippp0 I just get:
isdnctrl addslave ippp0 ippp1
addslave: No such device


The ippp1 is not in use and the node is there. Also I have mp support in the kernel (2.2.18). I'm using isdnctrl v3.0beta2.
Any ideas?