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随着Internet／Intranet的飞速发展和话音分组化趋势的不断增强，IP网上的话音业务VoIP（Voice－over－IP）受到了越来越多的关注。它的优越之处在于：在单一网络上集成了不同业务，避免了维护各个独立的网络及其硬件的费用；网络运营者可以扩展其业务范围；消费者可以享受价格
With the rapid development of Internet / Intranet and the trend of voice packetization, Voice-over-IP (Voice over IP) is gaining more and more attention. Its advantages are: integrated in a single network of different business, to avoid the maintenance of each independent network and its hardware costs; network operators can expand their business scope; consumers can enjoy the price