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For high investment funds to unified communications, in order to improve the popularity of unified communications, UCaaS solution was designed and developed. The overall scheme was based on the cloud computing architecture and consisted of the service layer, the call control layer, the terminal access layer and the service and network management layer. Simultaneously unified communications services were analyzed, including basic voice services, multimedia conferencing, collaborative services, unified messaging, terminal services, etc. Voice gateway techniques were studied. the trunk gateway was designed to improve the networking capability, the access gateway was designed to expand the terminal business. The implementation technology about cloud architecture was explored, including P2PSIP technology, virtualization technology, video codec technology.P2P architecture can make the system adapt to the situation of node failure dynamically and improve the reliability and robustness of the whole system. In order to ensure video quality, video conferencing use scalable video coding technology to deal with the uncertainty and instability of the line bandwidth. The research results were applied to the public security intelligent police cooperation system, which improves the user perception of the speech system. Industry status was analyzed. At the same time, we look to the future prospects.