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集团电话、交换机
  
VOIP的定义
      VOIP又称IP电话或IP网络电话,是Voice Over IP的缩写,这种技术通过对语音信号进行编码数字化、压缩处理成压缩帧,然后转换为IP数据包在IP网络上进行传输,从而达到了在IP网络上进行语音通信的目的。IP电话极大的改进了网络带宽的利用率,大大降低了通信的费用,它的广泛应用也促进了宽带多媒体应用的发展。
VoIP最大的优势是能广泛地采用Internet和全球IP互连的环境,提供比传统业务更多、更好的服务。
 VoIP可以在IP网络上便宜的传送语音、传真、视频、和数据等业务,如统一消息、虚拟电话、虚拟语音/传真邮箱、查号业务、Internet呼叫中心、Internet呼叫管理、电视会议、电子商务、传真存储转发和各种信息的存储转发等
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