一种基于应用层的安全保密IP电话QoS保障方案及实现

A Secure IP Phone QoS Guarantee Scheme and Implementation Based on Application Layer

提出了一种基于应用层的安全保密IP电话QoS保障方案并实现.在语音加解密过程中,通过多缓冲区的合理设置和加密模式的设计,降低了时延和带宽.针对网络丢包问题,提出了一种改进的错误隐藏技术,并与前向纠错技术集成应用,较好地完成了丢失包的恢复.采用自适应播放延迟方法,解决了时延抖动所导致的语音播放不流畅问题.在模拟发生包丢失和包错序的网络环境中进行了测试,IP电话在满足安全保密通信的前提下,时延、带宽和丢包率等指标都达到了商用电话的标准,具有较强的实用性.

Based on application layer this paper presents a secure IP phone QoS guarantee scheme and implementation.In the voice encryption and decryption process,the design of multi buffer reasonably and encryption mode,reduce the time of delay and bandwidth.In view of the network packet loss problem,an improved EC and FEC are integrated to acomplish the packet loss recovery.The adaptive playout delay method solve nonfluency of playback caused by the voice delay jitter.Secure IP phone is tested in the environment of the network simulated occurrence of packet loss and packet disordering.The results of test show that time delay,bandwidth comsumption and the lost probability of system can satisfy the demand of secure IP phone QoS,and which has a better use.