Actually the port count for a basic package IS 48. However, you can have only 32 stations (digital or analog) and 40 CAR keys, or a total of 72 CARs and station ports programed. You can also, have 16 basic trunks. This makes a total of 48 physical and 40 CAR (phantom or secondary incoming extension keys). and 16 trunks either copper or T-1. Simply, this means you can add a 4 port station card only without installing a PKU chip.