Open Internet business telephone line of business for many years, the business operation is successful on the whole, the voice quality through continuous improvement is the basic to achieve a satisfactory program, with the popularity of VoIP public business, some international IP telephone network company, the company self-built network, gateway and centralized management facilities, end-to-end management, and can provide all kinds of characteristic service, called ITSP (ISP), VoIP application in enterprises and departments of the unit are various, mainly is the internal telephone exchange (IP PBX) and two aspects of call center,
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