Gigabit Ethernet LAN, MAN and WAN environments, dense wavelength division multiplexing and PacketoverSDH etc. The implementation of the new technology, allows for a lower price for the increase of the data network more bandwidth, therefore, based on the highway communication net VoIP phone network is very effective, it is satisfying the highway within the jurisdiction area of the daily administrative business telephone communication at the same time, make the IP voice more effective intervention to the business of the expressway toll collection, make the IP private network efficiency higher, better quality fee, highlights the application value and development prospect of VoIP technology,
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