Voice recording

A group of speakers need two phone. One is to record audio on the app, the other dial umeeting and put the phone on speakerphone. After the two phones are prepared, the recording can be start. The mobile phone data channel and telephone channel data need to be collected at the same time. And then, the two audios should be aligned and cut, which means that when the two audios are played at the same time, the voice overlap. The format of a telephone channel is different from the audio format recorded by a mobile phone.