对话可以分为INVITE事务和非INVITE事务，其中INVITE事务又包括请求消息和响应消息（）
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对话可以分为INVITE事务和非INVITE事务，其中INVITE事务又包括请求消息和响应消息（）
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CANEL事务既能用于CANCELINVITE事务，也能用于CANCEL非INVITE事务（）
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INVITE事务由一个三次握手组成。客户端事务发送INVITE，服务器事务发送响应，客户端事务还，要发送一个ACK（）
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SIP INVITE消息中，标识一次对话的是（）
A.Cseq B.Call-ID C.Tag D.Branch
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If the person you invite is your immediate boss or your_teacher, you need to invite in a comparatively formal manner（）
A.respectful B.respective C.respected D.respectable
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SIP事务呼叫启动包含两个操作请求：邀请（Invite）和证实，前者需要回送响应，后者只是证实已收到最终响应，不需要回送响应（）
A.）对 B.）错 C.选项K
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INVITE在非procondition的基本会话流程中包含哪些SIP消息（）
A.INVITE B.180RING C.200K D.UPDATE
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“May I have the honor to invite you to be my guest at today’s banquet.” is an informal expression to invite friends to dinner.
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Jacques invite visiter sa ferme（）
A.les ; de B.leur ; à C.les ; à D.leur ; de
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I took it as an honor __________________ (invite) to the meeting.
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If I （） you,I（） invite him to go to see a movie.
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