The Cisco CP‑7821 is a dual‑line wired IP phone that runs on PoE, featuring an 8.89 cm LCD for caller ID and voicemail alerts. It supports G.711a, G.722, G.729A/B, iLBC codecs, conference calling, call waiting, forwarding, and 802.1x RADIUS security with QoS. The polycarbonate body and digital volume control provide durability and clear audio in any office setting.