Cisco SPA509G PoE 12-Line IP Phone - NewCisco SPA509G 9 Line IP Phone Description: The Cisco SPA509G is a 12 line IP phone that provides access to a wide array of lines and calls for a small business. The SPA509G is compatible with and designed to work on the Cisco UC500 phone system. The Cisco IP phone can either work on SIP or Smart Phone Control Protocol (SPCP). Cisco SPA509G Features: 12 Line Appearances 4 SIP Registrations Backlit Display Self Labeling Monochrome Full Duplex