pjsip win32启用视频通话

http://yeyingxian.blog.163.com/blog/static/34471242013101835444648/ 须要下载其余几个额外的库以及sdk来编译pjsip，使得其支持视频通话php Windows SDK Update for Windows Vista http://www.microsoft.com/en-us/download/details.aspx?id=

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