Although VoIP application in China's earliest or circuit switching in the operators do, but now there are many corporate users have began to focus on the VoIP this application, small office for the emerging company, with abundant new data network bandwidth to carry voice, than to build a set of independent voice system convenient many, function also has the traditional voice switches, such as mobile office, do not have, for the industry users, because there are connected each branch node data network, using IP relay interconnection between headquarter and branch node can save the high cost of renting the long-distance circuit relay,
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