The Yealink SIP‑T46U is a premium, productivity-enhancing IP phone designed for busy professionals and executives. Boasting a crisp 4.3″ 480×272 color LCD, it supports up to 16 SIP accounts and features Optima HD Voice with Acoustic Shield and Opus codec for clear, natural calls even in noisy environments 

Equipped with dual Gigabit Ethernet ports (one PoE-capable), two USB 2.0 ports, and options for Wi‑Fi/Bluetooth via dongles, it’s built for flexibility: connect headsets, record calls, and add wireless modules with ease The phone supports expansion via the EXP43 module, offering large-scale programmable key capacity 

Robust enterprise-grade security features include TLS 1.3, SRTP, AES encryption, secure boot, VPN, and Wi‑Fi WPA2/WPA3  Zero‑touch deployment simplifies large-scale rollouts via IT portals and unified firmware across the T4U series