SIP支持建立和终止多媒体通信的五个方面：用户定位、能力与可用性、通话建立和通话处理。
SIP supports five facets of establishing and terminating multimedia communications: user location, capabilities and availability, call setup and call handling.
两个或更多台站间相互完成了通信即为进行了一次交换。交换程序包括以下内容：初始呼叫、回答呼叫、确定工作频道、发送信文、回答信文、终止发送。
This applies when two or more stations achieve communication with each other. An exchange is then said to be taking place. It consists of the following.
通过向各安全节点分配连续的、唯一的节点标识，并将标识嵌入到消息中，该算法可以利用求和公式实现通信终止判定。
On the message-passing trees, a continuously and unique identifier was allocated to every secure node, and these IDs were embedded into messages when nodes sending information.
通过向各安全节点分配连续的、唯一的节点标识，并将标识嵌入到消息中，该算法可以利用求和公式实现通信终止判定。
On the message-passing trees, a continuously and unique identifier was allocated to every secure node, and these IDs were embedded into messages when nodes sending information.
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