This is Panasonics’ newest, latest and greatest voicemail system. The KX-TVA50 works GREAT with the KX-TAW848, KX-TA824, KX-TA624, KX-TD1232, KX-TD816 and KX-TD308 telephone systems. It comes out of the box with 2-port and is expandable to 6. You can also add a internal modem card, and a LAN card. With the LAN card you can have voicemail messages sent to your EMAIL!!!