There are a lot of people talking about the advantages of various Internet phone (VoIP) services, but when your company decides to use VoIP technology, in addition to select service enterprises, there are many other decisions need to be done, this paper introduces the phone software, hardware equipment, software phone hardware (such as IP phone VoIP telephone related knowledge, software telephone is a foundation, is to make a personal computer called a kind of network computer software, and its matching is a software phone hardware equipment, in addition to this, VoIP interface card, VoIP gateway, VoIP PBX is indispensable,
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