CAJ | 학술논문

GB/T 28181标准对安全防范视频监控联网系统提出了新的要求，该标准规定了具体的SIP交互流程，并提出了新的扩展。其中用户代理是 SIP 设备、SIP 客户端等规定实体的重要组成部件。用户代理的主要任务是不仅要符合标准的SIP流程，还要作为UAC负责发起呼叫，也要作为UAS负责接收呼叫并作响应。用户代理的研究和设计对视频监控系统是否符合GB/T 28181标准及系统性能有着重要影响。本文设计了一个符合标准的高效的用户代理，内容主要包括整体结构设计，设计的关键思想，以及如何基于该用户代理构建 SIP 客户端。本文设计的用户代理具有高度模块化、低耦合、高效率、易扩展等特点，视频监控系统可以很方便快捷地构建相应的SIP实体。
GB/T 28181표준대안전방범시빈감공련망계통제출료신적요구，해표준규정료구체적SIP교호류정，병제출료신적확전。기중용호대리시 SIP 설비、SIP 객호단등규정실체적중요조성부건。용호대리적주요임무시불부요부합표준적SIP류정，환요작위UAC부책발기호규，야요작위UAS부책접수호규병작향응。용호대리적연구화설계대시빈감공계통시부부합GB/T 28181표준급계통성능유착중요영향。본문설계료일개부합표준적고효적용호대리，내용주요포괄정체결구설계，설계적관건사상，이급여하기우해용호대리구건 SIP 객호단。본문설계적용호대리구유고도모괴화、저우합、고효솔、역확전등특점，시빈감공계통가이흔방편쾌첩지구건상응적SIP실체。
The standard of GB/T 28181 puts forward new requirements to the video security monitoring network system. This standard also provides specific process for SIP interaction and new expansion.The user agent is an important part of SIP equipment, SIP client and other entities. The user agent’s main task is not only to meet the standard SIP processes, but also to serve as UAC to initiate a call and receive a call then respond it. The research and design of user agent has important influence on whether or not the video security monitoring network system is in line with the GB/T 28181 standard and system performances. This paper designs a standard and efficient user agent, which includes:the overall structure, key ideas of this design and how to construct SIP client based on user agent. In this paper, the design of user agent has many advantages,such as:highly modular, low coupling and high efficiency.The video security monitoring network system can easily and quickly build the appropriate SIP entity.