在此基础上，对简单的SIP网络模型进行了分析，并给出了新的SIP网络模型：基于事件通告的会话发起协议网络模型。
On the basis of exploring, analyze the simple SIP network model and present the way of improving this system: SIP model based on Specific Event Notification.
在此基础上，对简单的SIP网络模型进行了分析，并给出了新的SIP网络模型：基于事件通告的会话发起协议网络模型。
On the basis of exploring, analyze the simple SIP network model and present the way of improving this system: SIP model based on Specific Event Notification.
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