摘要
IP电话是一种数字电话,是技术创新的一种通信服务业务,它把语音、压缩编码、打包分组、分配路由、存储交换、解包解压等各种交换处理组合在IP网或互联网上实现语音通信。因特网语音通信是VoIP技术的一个最典型的,也是最有前景的应用领域。介绍了VoIP的通信原理、关键技术和系统通信中的SIP协议,分析了影响VoIP的QoS的主要原因,阐述了时延、抖动、丢包和回声等影响QoS的机理和解决方案。
IP telephone is a kind of digital telephone,and is an innovative type of communication service.It combines a variety of switching processes into the IP network or Internet for realizing speech sound communication,such as speech sound,compressed encoding,packaging and packeting,distribution routing,storage and switching,depackaging and decompression.The Internet speech sound communication is a most typical and promising application field of the VoIP technology.The communication theory and the key technology of VoIP are introduced,an important SIP protocol in the system communication is introduced.The reasons influencing QoS of VoIP are presented.Some technological problems such as delay,jitter,lost packet and echo are analyzed,and the existing solutions of these problems are given.
出处
《现代电子技术》
2010年第9期58-62,共5页
Modern Electronics Technique
