呼叫的第二档从目标方或应答设备接听该电话时就立即开始。
The second leg of the call begins as soon as the destination party or answering device answers the telephone.
当收到一个出问题的分片，Tcp立即产生一个应答。
TCP may generate an immediate acknowledgment (a duplicate ack) when an out - of-order segment is received.
当收到一个出问题的分片，Tcp立即产生一个应答。
TCP may generate an immediate acknowledgment (a duplicate ack) when an out - of-order segment is received.
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