With the rise of the trend of economic globalization, the internationalization of enterprises and the geographical dispersion characteristics
More and more obvious, many large enterprises engaged in cross-regional even multinational production and business operation activities,
Even some smaller companies, often across the region or multinational offices
Institution, enterprise internal telephone communication becomes a crucial question, however the traditional
Telephone is too expensive, on the one hand, telecom company set rates on the high side, on the other hand,
The key with the computer network can't unity, thereby increasing costs, the emergence of IP technology,
To solve these problems, to integrate the voice traffic into data communication network,
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