本文探讨了SIP协议性能测试方法与评价标准，提出了基于基本呼叫流程的测试方案，并对测试方案中SIP信令和媒体流的NAT穿越问题作了深入的分析。

This thesis discusses SIP performance test method and criterion, putting forward test schemes based on basic call flows and analyzing the problem of SIP signaling and media stream traversing the NAT.

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例如，业务分析师可以通过创建一个分析流，从客户电子邮件或呼叫中心报告中提取出结构化信息。

For example, a business analyst might create an analytics flow to extract structured information from customer e-mail or call center reports.

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您也可能希望另一个应用程序能够通过Web将其他用户邀请到同一个媒体流中，例如会议呼叫应用程序。

Another application may want to, from the Web, invite another user into the same media stream, such as with a conference calling application.

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