随着我国通信事业的发展，电话得到极大普及。进入90年代，国外的语音卡和相应的软件等语音产品进入中国，利用这些语音卡开展的各种电话增值业务也得到了飞速发展。语音卡都具有自动应答、拨号、挂断、发音、检测线路信号的功能，并配有C语言开发工具，可将其插入PC机中。每卡 With the development of China’s communications industry, the telephone has gained tremendous popularity. Into the 90’s, foreign voice cards and related software products such as voice into China, the use of these voice cards to carry out a variety of telephone value-added services has also been rapid development. Voice cards are automatically answering, dialing, hanging up, pronunciation, testing line signal function, and with C language development tools that can be inserted into the PC. Per card