The combination of VoIP and WiMAX well realize the complementary advantages, to get, but also a good title for the big trend in the development of communication technology, on the other hand, after the combination of the two also does face some short term can not completely overcome the technical bottleneck, such as: mobile environment QoS guarantee mechanism, the improvement of the network structure and the reliability, security and authentication and so on, from this point of view, the future of the technology development is bound to experience a difficult process,
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