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The Yealink SIP-T77U is a professional IP phone featuring a black housing and a 7" LCD screen with 800 x 480 pixel resolution. It supports both wired and wireless handsets with a 1000-contact phonebook capacity. Volume is controlled via physical buttons, and management is handled through the Yealink Device Management Platform. Supported voice codecs include G.711a, G.711u, G.723.1, G.726, G.729, G.729A, G.729B, and G.729ab. Firmware is available in Dutch and international versions.