通过SIP消息，两个对等体可发起通信会话。
Through the SIP messages, the two peers initiate a communication session.
SIP地址在创建通信会话期间唯一地对用户进行标识。
The SIP address uniquely identifies a user during the creation of a communication session.
SIP是为帮助协商两个对等端之间的交互通信会话而设计的。
SIP was designed to help negotiate an interactive communications session between two peers.
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