Panasonic KX-TA824 Key Service Unit (Refurbished)The Panasonic KX TA824 is an analog phone system. It is initially equipped to handle 3 incoming telephone lines (with built in caller ID) and 8 telephone extension ports. It is expandable up to 8 incoming lines and 24 extensions. The Panasonic phone system KX TA824 is the first Panasonic phone system to offer an optional plug in Panasonic Voice Mail card which can provide each Panasonic phone with its own Panasonic voice mailbox to take messages from