SIP标准凭借其简单灵活、易于扩展、便于实现等诸多优点越来越得到业界的青睐,而且随着大型联网安全与视频监控平台在各个领域的应用越来越广泛,业内人士发现SIP标准作为联网监控的信令标准承载协议,具有多种优势及功能。前言2004年以来,全国各地公安机关自建了2万多个视频监控系统,安装了百余万台摄像机,建立了打防管控相结合的立体化治安防 With its simple and flexible, easy to extend, easy to implement and many other advantages, the SIP standard is getting more and more favored by the industry. With the application of large-scale networked security and video surveillance platforms in various fields becoming more and more widely, the SIP standard is found in the industry as a networking Monitoring signaling standard bearer protocol, with a variety of advantages and functions. Foreword Since 2004, more than 20,000 video surveillance systems have been built by public security organs throughout the country, over a million cameras have been installed and a three-dimensional security control system has been established