支持VoIP电话紧急呼叫的QoS保障方案及其仿真

Support QoS for Emengency VoIP Calls and the Evaluating

紧急呼叫在Internet上是一个非常重要的任务,在有限带宽情况下尽可能多地接受VoIP呼叫是必要的;但同时为紧急呼叫提供高质量的服务也是必须的。本文基于一种保证端到端的VoIPQoS服务模型,提出了新的方案。该方案基于DiffservAF服务模型、SIP信息段和一种通过观察VoIP数据流信息而设计的呼叫接纳信令,来为紧急VoIP提供高质量服务。最后,根据网络仿真结果性能指标,验证提出方案的合理性、可靠性。

Emergency call is a very important task on the Internet. It is a requirement to accept as many VoIP calls as possible, however, it is obligatory to provide high quality service for emergency call in limited bandwidth. This paper puts forward a new scheme based on end-to-end QoS service model： it provides high quality service for emergency call using Diffserv AF service model and a call admission method based on observing VoIP flow information and a log of SIP messages. Finally, the scheme is validated with rationality and dependability based on the final emulator results throughout the emulator.