Cisco 7931G Unified IP Phone - Graphical Display, Speakerphone, PoE, Requires Cisco Call Manager Graphical Monochrome Display (192x64 pixels) 10/100BASE-T Ethernet connection, 2x RJ-45 ports Full-Duplex Speakerphone, Headset port (Headset sold separately) 24 user-selectable ring tones, 24 lighted line keys Requires Cisco Call Manager License, Power Over Ethernet (PoE) (Power adapter sold separately)