VPN自动拨号程序，程序退出自动挂断，可用于远程访问控制，内含电话拨号程序片断。-VPN automatic dial-up procedures, procedures to withdraw from automatic hang up, can be used for remote access control, telephone dial-up procedure includes clips.

AT指令集的电话拨号程序，详细源码，可运行，需要的童鞋请下载！-Phone Dialer AT command set, a detailed source code can be run, the students need to download!