A caller first locates the appropriate server,then sends a SIP request (probably an invite). In a perfect world,the request arrives at its destination,where the client accepts the call by returning a SIP response code 200.

 
  • 呼叫首先确定适当的服务器,然后发出SIP请求(很可能是一个邀请),在一个完美的世界中,此请求到达其目的地,在此客户机通过返回SIP应答代码200表示接受此通话。
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