集中管理中心与集中管理式电话计费器之间可通过公众电话网以拨号方式建立双向通信链路，从而实现对集中管理式电话计费器的远程管理。
Between the center and the devices, the duplex communication links are created through the public switched telephone network, thus the remote management for the devices is realized.
您也可以决定异步发送回一个消息，建立一个双向通信。
You can also decide to send a message back asynchronously establishing a two-way communication.
comet流和混合轮询应用程序在初始连接建立后都允许双向通信。
Both Comet streaming and hybrid polling applications permit two-way communication once the initial connection is set up.
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