This article describes the concepts of IP phone, key technology, realization principles, software and hardware supports.
本文作者阐述了IP电话的概念、关键技术、实现方式及所需的软、硬件设施。
By using the realization principles of the expanded at commands, it perfects the design of at module and ultimately achieves the main functions of call management.
利用扩展AT命令的实现原理，完善了对AT模块软件的设计，并最终实现了通话管理的主要功能。
By using the realization principles of the expanded at commands, it perfects the design of at module and ultimately achieves the main functions of call management.
利用扩展AT命令的实现原理，完善了对AT模块软件的设计，并最终实现了通话管理的主要功能。
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