第三，如果想要与朋友打电话，则必须双方约定同时上网，并同时连接到同一网络电话服务器上。
Thirdly, if you want to talk with your friend, the two of you must appoint to get connected to the same IP server at the same time.
该方法涉及 的网络电话系统包括一网络电话配置服务器、一网络电话设备以及一主控台。
The said network phone system includes a configuration server of network phone, network phone equipment and a main control desk.
实现中转服务器后，可以方便的统计在某一时段网络电话的使用情况，从而可以做出针对性的优惠措施，获得更大的经济利益。
By the transit server, we can statistic the use of VoIP in a certain moment conveniently, which can help us to offer targeted incentives and gain greater economic benefits.
本文设计并实现了基于SIP协议网络电话中转服务器，并在本文的结尾部分对中转服务器的下一步工作做出了展望。
The paper shows the design and implementation of the transit server based on SIP protocol. At the end of this thesis, the next work of the transit server in prospect.
本文设计并实现了基于SIP协议网络电话中转服务器，并在本文的结尾部分对中转服务器的下一步工作做出了展望。
The paper shows the design and implementation of the transit server based on SIP protocol. At the end of this thesis, the next work of the transit server in prospect.
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