CISCO 6821 PHONE FOR MPP NA POWER ADAPTER REMANUFACTUREDCisco 6821 IP Phone Refurbished Corded Corded Wall Mountable 2 x Total Line VoIP 2. 5" (63. 50 mm) LCD 2 x Network (RJ 45) PoE Ports VPN: CP 6821 3PWNAK9 RF SKU: CS9331 UPC: Uses VoIP technology to transfer audio signals over the Internet while circumventing high toll charges by telephone companies Electrical power and data are transmitted using a single cable to devices such as Access Points, IP cameras or IP phones