虽然我们的电话业务已达到国际竞争水准，但我们仍将继续对其进行改善，提供诸如虚拟专用通信网和折扣业务等。
Although our telephone business has reached international competitive standard, we will still be kept on perfecting it, providing businesses such as virtual private communication network and discount.
文章提出了电话虚拟专网P_ VPN安全模型，其体系包括管理层、传输层和控制面。
This paper presented the virtual telephony network, P_VPN. The architecture of P_VPN includes management layer, transmission layer and control plane.
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.
论述采用PSTN电话网，建立“虚拟”多点数据监测的依据和实现方法，实现利用既有PSTN电话网络和线路资源，完成多种信息采集、传送功能。
To make a good use of resource of the PSTN telephony lines, to complete various functions of data collection and transmission is also presented.
论述采用PSTN电话网，建立“虚拟”多点数据监测的依据和实现方法，实现利用既有PSTN电话网络和线路资源，完成多种信息采集、传送功能。
To make a good use of resource of the PSTN telephony lines, to complete various functions of data collection and transmission is also presented.
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