Samsung Prostar 816 Plus Business Phone System is a very reliable phone system that operates the Prostar 816 standard and 816 LCD telephone sets. The Samsung Prostar 816 Plus system does not allow for caller ID, but voicemail can be added. The compatible voicemail is called the Samsung Starmail. Prostar 816 Plus System starts out with four incoming lines and up to eight telephones. Prostar 816 Plus can be expanded to eight lines and sixteen phones. Allows for music on hold, transfer, intercom and paging.