DoorKing provides a full range of telephone entry systems and accessories to meet your specific application requirements. The 1830 series (1833, 1834, 1835, 1837) are PC programmable systems and include the DoorKing Remote Account Manager and Transaction Analysis software. The 1802, 1803, 1808 and 1810 systems are ideal for basic stand-alone telephone entry control. The 1812, 1816 and 1820 Telephone Intercom Systems provide two-way communication and control of a door or gate through a residents telephones without the need of Central Office phone service.