关键词: Windows;电话线路;数据通信;TAPI
The Design and Implementation of a Telephone-Line Based Communication Program in Windows Operating System
Abstract
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