My system uses a voip line so I don't have that problem.
As of 2006, vmware was not capable of abstracting things like PCI cards to virtual machines. It required more standardization on the part of PCI cards and the vmkernel needed a rewrite, so as of those days, vmware doesn't support FXO/FXS cards.
However, that was three years ago. Things could have changed since then, I'm honestly not sure.