For Digium Cards:
"If you want to use KVM you'll need VT-d.

Xen supports paravirtual PCI passthrough which doesn't require VT-d. I
don't know about Vmware, etc.

Best Regards
Kenni Lund"
This does not include the processors in [[Gaia]] so that implementation will have to use [[XEN]] if the Asterisk server will be virtualized. Or move away from using the Digium cards