This paper introduces this protocol and proposes an implementation of a SIP server.

本文基于SIP协议，提出了一个SIP服务器系统的设计与实现方案。

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The article discusses the systemic logical architecture, the integrated design of the SIP Server system, the project of the SIP terminal and working flow of the system.

着重讨论了该系统的逻辑结构、SIP服务器的集成设计、SIP终端的设计方案及该系统的工作流程。

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This system solves the SIP server configuration, maintenance of the inconvenience and server bottlenecks and other problems. And has adaptive, low cost, easy to expand and other characteristics.

该系统解决了目前SIP系统中服务器配置、维护带来的不便，以及服务器瓶颈等问题，具有自适应、成本低、易于扩展等特性。

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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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