文末最后又详细介绍了虚拟专网和免费电话800业务。
Finally, the paper introduces virtual private net-work and free telephone (800) services.
中国铁通互联网是实行统一管理、集中调度的高速宽带IP，可向用户提供互联网接入、多协议标签交换虚拟专网等业务。
CTT net is a high speed broadband IP network with concentrated condition and unified management, which can provide users with Internet access, - and other functions.
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