电话网路 Telefonnetz ; Public Switched Telephone Network ; PSTN
电话网路线路 TNV Circuits
公共交换电话网路 public switched telephone network ; PSTN
分封交换电话网路 packet switching telephone network
公开转换电话网路 public switched telephone network
电话网路图 exchange area layout
网路电话 VoIP
公众电话网路 Public Switched Telephone Network ; PSTN
交换电话网路 Public Switched Telephone Network ; PSTN
即现今公众电话网路 Public Switched Telephone Network ; PSTN
由于它的国际业务，UPS可为超过四十亿人提供服务，是所有电话网路所及人数的两倍。
With its international service, UPS can reach over four billion people, twice the number of people who can be reached by any telephone network.
介绍中国联通IP电话业务试验网的网络构成，网络协议及网路组织，并提出IP电话网建设的几点建议。
This paper introduced the construction, network protocol and organization of the IP experiment network founded by China Unicom.
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