基于IP网络及其协议的公共性质，使得VoIP天生就具备相对于传统电话网而言更易受到攻击的特质。不过，通过采取一个仔细规划的、多层次的VoIP网络防护措施，企业就可以让VoIP网络的安全程度赶上甚至是超过传统的电话系统-IP-based network and its public nature of the agreement, making VoIP inherently possess relative to the traditional phone network more vulne

高集成度与优化特性不仅能以仅为前代应用系统十分之一的成本实现同等的高性能，同时还确保了所需的高灵活性，以满足多会议单元(MCU)与视频安全监控等应用-High level of integration and optimization features not only the previous generation of only one-tenth of the cost of application system to achieve the same performance, while

移动自组网多安全等级路由策略的分析与仿真Multi-level MANET Routing Security Analysis and Simulation-Multi-level MANET Routing Security Analysis and Simulation