In the rapid development of network technology, most users can simultaneously or alternately use multiple communication terminals. At this time, how to build a control platform of integrated network to help users manage multiple terminals has become the focus of mobile network technology research and development. On the basis of understanding the design content of the network control platform and according to the three types of network selection algorithm, this paper analyzes how to build the architecture of the multiterminal collaborative network control platform based on the open source Mobicents design and conducts test research on its system implementation.