I am using a openvox d410p to send calls from asterisk to pri lines
call quality is pretty bad, i was told that the interrupt frequency is very unstable for this PCI card.
Couple of tweaks with acpi and smp were done to improve the quality but it still needs to get better.
Motherboard is Gigabyte GA-H55-USB3.
I can provide bios access.
Please only bid if you have extensive knowledge in these things.