I dont know of a pci based card most are external but I know they have to be set to dumb mode and leased line, this is 2 wire voice circuit. You have to look at your modem specs closely because some will list the command to do this but they will not work. Look for external business type modem multitech will do this. One has to be set in answer mode on one end and the other will be set to calling mode on the other end, the speed has to match as well. You will need two modems on each end it does not matter which end is set to answer or call but the must work as a pair so I would recommend you get all the same brand.