Figure 3 shows how a typical high-level flow is implemented in our environment. It shows the initiation of a SIP session, followed by multiple Web service requests and responses.

图3展示了如何在我们的环境中实现一个典型的高级流，包括发起一个SIP会话，以及多个Web服务请求和响应。

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One main element in the foundation of voice and video convergence on IP is the Session Initiation Protocol (SIP).

IP上语音和视频聚合的一个主要基础部分是会话发起协议(SIP)。

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

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。

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The final layers of security include a pair of authentication certificates residing on the handsets, as well as requiring users to log-in with a password before they can use the SIP (Session Initiation Protocol) server.

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