voip现状分析及未来发展（VoIP status analysis and future development）.doc

voip现状分析及未来发展（VoIP status analysis and future development） The backstage management equipment is responsible for billing, authentication, network management and other functions. Since the 90s of last century, the major telecom operators began to build IP telephone network according to the H.323 protocol, and formed a considerable scale. Based on H.323 protocol IP telephone network is also the most widely used VOIP implementation technology. According to statistics, at present, the international long-distance business is a considerable part of the traffic through the operators of the H.323 long-distance IP power Network transport. Among them, the IP telephone network built by China Unicom is the largest commercial IP telephone network in the world, which takes on hundreds of millions of minutes of international and domestic long-distance traffic every year. not only Telecom operators, the major network of professional VOIP part, basically also adopted the H.323 technology. After several years of practice, has accumulated a large number of operational management experience. The IP telephone network based on H.323 is also the most complete VOIP operation network of network structure at present. The domestic standard provides clear three levels of networking for the network, and The role of each of these functional modules is clearly defined. In accordance with this standard, some telecom operators have built IP telephone networks covering three levels of the whole country. It is estimated that... To transfer all the long-distance calls to the existing IP telephone network, it only needs to expand the number of gateways to its access point without changing its current network structure Thats enough. With the increasingly widespread use of H.323 protocol, some problems of IP telephony network are found. First, the access segment also goes through the local PSTN/PLMN network, no Telecom operators with local network resources are constrained by the dominance of operations