public switched telephone networks pstn 公共程控交换电话网络
Introduces a remote monitoring-measuring system used for environmental protection based upon PSTN (Public Switched Telephone Networks).
介绍了基于PSTN(公共程控交换电话网络)的环保远程监测系统。
The call forwarding sample demonstrates the call forwarding feature typically seen in public switched telephone networks, but it USES a SIP network.
Call Forwarding示例显示了访问转寄的特性，该特性一般见于公共交换电话网络，但是它使用了一个SIP网络。
The limited transmission rate available on the Public switched telephone network (PSTN) and on wireless networks presents a significant challenge to digital video communications.
这些应用对传输速率有限的公共交换电话网(PSTN网)和无线网络提出了重大挑战。
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