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In order to improve the utilization ratio of network resources, in this paper, we propose a method to transmit voice and data in a frame using the silence times in voice. We followed it analyzing the major elements that affect voice transmission, get proper voice packet size, and reduce the voice transmission delay. And we get the best record point from the relational curve between voice delay and record rate base on the experiment results. This method achieves a high network bandwidth utilization ratio, while guarantee real-time voice transmission and correct data transmission.