The Yealink SIP-W77P is a professional DECT VoIP phone system designed for business communication environments that require reliable wireless connectivity. This IP telephony solution operates with the SIP protocol and features a base station that supports up to 8 simultaneous handset connections, offering flexible deployment options in offices, warehouses, and hospitality settings. The system supports HD voice quality with wideband audio and includes noise reduction technology for clear conversations even in noisy environments. The W77P base station measures 180 mm in width, 145 mm in depth, and 45 mm in height, weighing approximately 450 g. It has two Ethernet ports (LAN and PC) with 10/100 Mbps connectivity and supports Power over Ethernet (PoE) for simplified installation. The accompanying handsets feature a 1.8-inch (4.6 cm) monochrome display with a resolution of 128 x 160 pixels and include a built-in hands-free function. The battery life provides up to 12 hours of talk time or 200 hours in standby mode, with the 1100 mAh lithium-ion battery taking about 3 hours for a full charge. The system supports multiple SIP accounts and includes advanced telephony features such as call forwarding, call waiting, conference calls, and directory management with a capacity for up to 500 contacts. Security features include encryption for voice communication and support for multiple authentication methods. The operating temperature range is between 0 °C and 40 °C with a humidity tolerance of 10% to 90% non-condensing. The Yealink SIP-W77P represents a robust wireless telephony solution for businesses looking to implement or expand their VoIP infrastructure while maintaining the convenience and mobility of DECT technology.