In general, the network of the migration process occurs slowly, Yankee group analyst Art Schoeller said: "the call center to IP development is inevitable, but it is not so urgent, driven by cisco from traditional TDM (Time Division Multiple, time-division multiplexing, now generally refers to the traditional telecom network) network to IP network migration, driven by Rolm company is very similar to migration to the digital system by the simulation system, which takes more than 20 years, the former must also need quite a long Time, and this process will be more complicated,"
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