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The Yealink SIP-T31P is a professional VoIP phone with a gray design and built-in corded handset. It features a 1000-entry phone book and a 2.3" LCD screen with 132 x 64 pixel resolution. The device supports audio codecs including G.722, G.729, G.711, OPUS, and iLBC. It includes a Fast Ethernet port with 10/100 Mbit/s speeds and IEEE 802.3af PoE compatibility.