The Yealink W77P, a high-performance ruggedized SIP cordless phone system that can register 10 Yealink DECT W57R handsets, is the ideal solution for stressful situations. It features more functions, lines, and mobility. It supports up to 10 SIP accounts and 20 simultaneous calls, improving signal strength and responsiveness to provide a stable and good experience for your mobile communications. Whats more, W57R can secure itself from a fall of up to 3.5 meters, water splash in any direction, and dust ingress. Thanks to the vibration alarm, you are guaranteed not to miss any calls, even in noisy and stressful situations.