终端拨号连接
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针对通信功能，研究了GPRS功能模块，相关的AT命令，以及拨号上网过程，实现移动终端与移动代理服务平台之间的连接通信。
Refer to communication, GPRS function framework, corresponding AT command and dial into internet process is discussed. And it is realized to communicate between mobile terminal and server.
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