The Yealink SIP-T44U is a professional VoIP desk phone designed for business communication environments that require reliable voice-over-IP functionality. This IP phone features a high-resolution 4.3-inch color LCD display with a resolution of 480 x 272 pixels for clear visual information presentation. The device supports Power over Ethernet (PoE) for simplified installation and includes an integrated Gigabit network switch with two 10/100/1000 Mbps Ethernet ports. The caller ID function allows users to identify incoming calls before answering, while the built-in dual-port Gigabit switch enables connection sharing with a computer. The phone supports up to 12 SIP accounts and 12 lines, providing flexibility for multiple communication channels. Audio quality is enhanced by HD voice technology with wideband audio support and two integrated microphones for clear conversations. The physical dimensions are 220 mm in width, 215 mm in depth, and 175 mm in height, with a weight of 950 grams. The unit operates in a temperature range of 0 °C to 40 °C and features a modular design with expansion options for additional modules. Connectivity options include two USB ports for peripherals and a headphone jack for private listening. The keypad is backlit for visibility under various lighting conditions, and the phone supports multiple language interfaces for international use. This model represents the successor to previous Yealink business phone models, offering enhanced processing capabilities and improved audio performance.