Hardware question - which card?

I am setting up a small office phone system with 4 grandstream 2000 phones. I currently have ordered a switch with poe, the linux box, and now i am looking for a pci card. The system will have one pot and one voip line. I assume i need the pci card to get the pot connected with the network. Any suggestions as to which card will do the trick? Thanks.

never mind got it figured out. Just was a little confused if I needed fxs and fxo.