电话网络是最大的通信网络，但是我们通常只是用来进行语音传输。为了更好的发掘电话网络的潜力，以及解决一些在没有互联网地区的数据的传输需要，开发一种可以通过电话线路进行数据传输的软件是很有必要的。

微软的电话应用程序接口（TAPI）是一种标准的应用程序接口（API），使得个人电脑能够通过运行微软的 Windows系统来使用电话服务。TAPI里面封装了所有的对MODEM进行操作的AT指令，从而我们只需要调用TAPI的函数而不需要知道底层的具体操作就可以执行一个呼叫和应答一个呼叫，以及其他的线路操作，从而快速开发出一个基于Windows平台的通过电话线路进行数据传输的程序。

本文介绍了开发次程序需要的理论基础包括Windows平台软件开发的基础、TAPI的概述、TAPI的基本概念。详细的介绍了软件开发的的思路和流程，阐述了整个呼叫的生命周期内的线路上所产生的状态消息，以及依据这些消息而应该进行的具体操作。根据软件开发的思路的指导以及整个线路消息为程序开发的脉络，本文最后介绍了一个可以在Windows下面拨打对方的电话号码，当双方连通后可以通过电话线路进行数据传输的程序的编码开发过程,并且最后程序进行了测试。

 

关键词： Windows；电话线路；数据通信；TAPI

 

The telephony network is the largest communications network, and it's generally used for voice transmission. To better utilize the advantages of the telephony network and meet the need of data transmission in places where Internet is inaccessible, it is definitely necessary to develop a software which could transmit data over existing telephone lines.

Microsoft's telephone Application Program Interface (TAPI), a standard application program interface (API), can help personal computers running Microsoft's Windows system to take use of telephone services. TAPI has encapsulated all AT commands for MODEM operation, which will only need users to call the TAPI function to initiate and answer a call, rather than to know the detail operation on the implementation, nor other operations on the lines. This would largely help to develop a program through telephone lines for data transmission, on a Windows-based platform.

The paper firstly describes the theoretical basis for the development of sub programs, including the software development basis on Windows platform, TAPI overview and its basic concepts. The paper then describes the detail ideas and processes on the software implementation. The paper also represents an entire call life cycle with its possible state messages, and the corresponding operations needed. Finally, on the one below in the Windows Call each other's phone numbers, when the two sides can connect through telephone lines for data transmission procedures for the development of the coding process, and in the final process of the test.

 

Key words: Windows; telephone lines; data Communications; TAPI