PoC is a smart terminal multimedia cluster application software with three functions of call,message and map.It is accessed through multiple network channels.The scheduling system can effectively meet multiple scenarios and multi-person work together.The call has two modes:normal and emergency,and its types include voice single call,video single call,voice group call,video group call,etc.Both individuals and groups can send and receive messages,which are text messages, voice messages,and file messages such as pictures,audio,and video.Maps are used to subscribe to members of the locations and to call other members based on location.