连接PBX与IP电话的接口分析及设计

随着互连网的普及和网络技术的发展,拨打网络电话已成为现实.由于网络电话低廉的费用,其发展与应用更是突飞猛进.大型企业或公司集团,往往具有内部程控交换机PBX设备,以及接入互联网络.在充分利用原有设备的条件下,文章提出一种连接PBX与IP话机的实用接口电路.它针对SP200型IP话机,以单片机AT89C52为核心,控制接口的摘机和挂机等工作过程,实现集团内部用户,在保留原有通话方式的基础上,直接拨打网络电话.实践证明:该接口成本低,工作可靠,整个系统运行稳定.

Analysis and design of interface between PBX and IP phone

With the popularization of internet and the development of network technology, dialing the network telephone has already become reality. Because of the cheap expenses of the network telephone, its development and application advance by leaps and bounds especially. Large-scale enterprise or company groups own inside private branch (telephone) exchanger (PBX) equipment and the internet connection equipment. Under the fully utilizing original equipment, the article proposes a kind of practical interface circuit, which joins PBX and IP phone. As far as SP200 is concerned, single chip microcontroller AT89C52, regarded as the core, monitors put-up and hook, etc. On the basis of keeping the existed way of conversing, the users inside the group can dial the network telephone directly. This interface is at low cost and reliable to work, the whole system is run steady.