Abstract: Embodiments of the present invention provide a system for recording voice data in a half-duplex communication. The system includes a voice data recording node and a data storing node; the voice data recording node generates a voice data record according to voice data received from a server and managing the data storing node, and the data storing node stores the voice data record. Correspondingly, a function of sending the voice data to the voice data recording node is added in the server. The system further includes an agent gateway. A user or an operator defines a filtering condition, defines an acquiring condition and searches for voice data via the agent gateway, and the filtering condition and the acquiring condition are stored by the voice data recording node. The voice data recording node connects to the agent gateway via an external searching interface and a management interface.