语音通道可以设定语音数据所在内存的初始地址，语音长度，采样率及播放方式等。

PCM digital channel have owns DMA, it can playback automatically when voice data length and initial address are set.

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由于语音通道将驻留在服务器上，因此它将支持异步通知并且不需要向交互管理器发送请求事件。

Because the voice modality would reside on a server it would support asynchronous notifications and would not need to send the request event to the interaction manager.

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这带来了如何向语音通道组件发起SIP(会话发起协议，Session Initiation Protocol)调用的问题。

This leads to the question of how to initiate the SIP (Session Initiation Protocol) call to the voice modality component.

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