One main element in the foundation of voice and video convergence on IP is the Session Initiation Protocol (SIP).

IP上语音和视频聚合的一个主要基础部分是会话发起协议(SIP)。

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The Session Initiation Protocol (SIP) is generally seen as the de-facto protocol to tap into the world of telecom.

会话发起协议（Session Initiation Protocol，SIP）通常被视为与电信领域建立联系的事实协议。

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Other protocols are using SCTP, such as the Session Initiation protocol (SIP) and the Common Channel Signaling System No. 7 (SS7).

其他一些协议也正在开始使用SCTP，例如会话初始化协议(Session Initiation Protocol, SIP)和通用通道信号系统7 (SS7)。

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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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