PTD2112的FXS终端的研究

FXS terminal device based on PTD2112

IP电话设备主要采用H．323和MGCP协议实现,但是H．323和MGCP协议实现过程复杂,给实际使用造成很多的问题。本文提出一种采用PTD2112的FXS终端的实现方法,VoIP协议采用实现简单的SIP协议,同时也能够确保电话业务的服务质量,电话业务接口的技术性能指标满足相关规范要求。重点阐述了基于PTD2112的FXS终端的硬件与软件的设计方法。电话接口的性能测试结果表明,所提出的方案在因特网运行良好。

A Foreign Exchange Station （FXS） interface connects directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone. We developed IP （Internet Protocol） telephone devices according to H.323 protocol and MGCP protocol. They are very intricate for us to do, as resulted in a lot of problems. The paper puts forward a portable design scheme of FXS terminal devices on the basis of PTD2112, which may he implemented by using SIP （Session Initiation Protocol） protocols, and assures QoS （quality of service）of telephone operation, and telephone operation interface accorded with correlative criterion. How to design and implement the hardware and software of FXS terminal device on PTD2112 is described： Performance testing result of telephone interface indicates that the design runs all right on Internet.