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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If peer side is a SIP server, MSS will use the external line information to register to peer SIP server.

如果对等方是一个SIP服务器，MSS将使用外部网上信息注册到对等SIP服务器。

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Figure 1 shows a single server which handles SIP function, and has a Web service capable of handling SIP functions for that specific SIP server.

图 1 显示了处理 SIP 功能的单个服务器，图中还有一项 Web 服务能够为该 SIP 服务器处理 SIP 功能。

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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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