VoIP is short for Voice over Internet Protocol, refers to the analog Voice signal after compression and packet, in the form of data packets in the IP network environment for Voice signal transmission, is also is popular Internet phone or referred to as "the meaning of IP phone, as a mature core network communication technology, VoIP is the biggest benefit for the enterprise cost savings, after the development of recent years, has made great progress in the applications,

With the expansion of business, at present, many small and medium enterprises, mainly in different regions and countries, opened a lot of branches, internal telephone communication is very frequent, long distance and international telephone communications costs is enterprise an important expenditure,
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