Hear every nuance with Poly HD Voice and Poly Acoustic Clarity technologies. Poly Acoustic Fence technology reduces distracting background noise and makes calling a pleasure. Enjoy the ergonomic design and the intuitive user touchscreen interface that saves you the hassle of learning new features and functions. When a phone is this easy, better collaboration and productivity arent far behind. "Entry-level" just got sweeterThe Poly CCX 400 is an entry-level business phone thats easy to use. Its interface is simple and intuitive. And contacts and meetings are one swipe or one tap away on a color touch screen. Design Product colour Black Handset type Wired handset Product type IP Phone Phone features Caller ID Yes Lines quantity 24 lines Display Touchscreen Yes Aspect ratio 16:9 Display resolution 720 x 1280 pixels Display diagonal 12.7 cm (5") Display LCD Audio Voice codecs G.722, G.729ab, G.711alaw, iLBC, G.711ulaw, OPUS Speakerphone Yes Network Security algorithms TLS, 256-bit AES, S