Public Switch Telephone Network 公用电话交换网 ; 公用交换电话网 ; 借助公用交换电话网 ; 公共交换电话网
Public Switch Telephone Net 公共交换电话网
public switch telephone network pstn 公共电话交换网
PSTN Public Switch Telephone Network 公用电话交换网络
Public Switch Telephone Network is one of mature networks.
公共交换电话网是成熟的网络之一。
PSTN (Public Switch Telephone Net) short message, which is recently introduced by China Telecom, is a non-voice value-added service.
固话短信是中国电信新近推出的一项基于固定电话网的非话音类增值业务。
China Unicom under such background began to set up IP Public Switch Telephone Network nationwide, and has rapidly covered all the IP PSTN in the country.
在这样的背景下，中国联通开始在全国范围建设IP电话网，并很快形成了覆盖全国的IP电话网络。
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