随着宽带业务的快速发展和大规模部署,使用宽带来做什么多媒体业务的问题日益突出。按照三网融合的思路,在基本实现了语音业务与计算机网络融合的VoIP业务后,接下来自然而然的想法是将传统的电视业务与计算机网络融合(即所谓的IPTV),最终实现TriplePlay。但IPTV远比VoIP来的复杂,不仅是VoIP中经常讨论的安全和服务质量问题,也不仅是IPTV新引发的诸如Multicast支持、内容分发和宽带改造那么简单。首先,什么是IPTV,它应该提供哪些业务和应用,这种基本问题还没有达成一致。其次,IPTV的产业链还不清晰;第三,技术选择很多而且正在发 With the rapid development of broadband services and large-scale deployment, the issue of using broadband to do multimedia services has become increasingly prominent. According to the idea of ​​triple play, after basically realizing the VoIP service in which the voice service and the computer network are converged, the next natural idea is to converge the traditional television service with the computer network (so-called IPTV) and finally implement TriplePlay. However, the complexity of IPTV over VoIP is not only a matter of security and quality of service frequently discussed in VoIP, it is not just the kind of IPTV-initiated new features such as Multicast support, content distribution and broadband transformation. First of all, what are the IPTV, what services and applications it should provide, this basic issue has not yet reached an agreement. Second, the IPTV industry chain is not clear; third, a lot of technology choices and is being made