The call system is an essential equipment in hospitals and nursing homes, and an important communication method for daily nursing and emergency rescue. Traditional wired calling systems are cumbersome to construct, difficult to repair, and costly to construct. More importantly, the wired system does not have the function of mobile receiving call information, which makes many patients lose the opportunity for rescue. With the continuous improvement of medical conditions in hospitals and nursing homes, more and more places adopt wireless call systems, which are easy to construct and maintain, and call operations are simple. Medical staff can receive calls from patients anytime and anywhere. The communication and wireless medical call system adopts frequency modulation (FSK) technology to ensure the success rate of calls and avoid signal interference.