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IP网络的迅猛发展使其本身所能提供的新业务也越来越多,话音和传真就是其中极为重要的一个应用。IP电话就是利用国际互联网(Internet)等基于IP的网络作
With the rapid development of IP network, more and more new services are provided by itself. Voice and fax are one of the most important applications. IP phone is the use of the Internet and other IP-based networks