To increase the security and the expansionary of the system, it uses SIP as a core protocol.
为增加系统安全性和可扩展性，采用下一代互联网络的核心协议—SIP作为控制信令协议。
But the design ideas of SIP, and the unreliability of the bear network, bring the great potential security problems on a large scale application of SIP.
但SIP的设计理念，以及其承载网络的不可靠性，为SIP的大规模应用带来了极大的安全隐患。
However, SIP is not mature enough. It's important and necessary for us to study its implementation, security and efficiency.
然而，SIP协议还不完全成熟，有必要对其运行效率、安全性和功能实现等方面作一些实际的研究和探索。
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