Problem Passthrough AVM GmbH Fritz!Card PCI v2.0 ISDN with PCIe to PCI Adapter in VM Engine (KVM) Posted December 16, 2020 Ahh understood. thank you for your explanation. I added it with Bind and the VFIO Plugin and also tested the new RC Unraid version but non of them was working. I ordered a USB ISDN "Card" hopefully this can be forwarded and is functional. Than this problem is not relevant anymore.