Analog calling device of the present invention consists of controller, digital processing unit, exchange network unit, codec, A/D and D/A converters 1-8 analog voice channel array units, an channel monitoring unit, in which the functions of codes, A/D converter and D/A converter are realized in one single component, and the functions of producing, receiving and processing digital signal in a DSP.The device has stable and high performance, complete functions and simple structure and all the parts may be installed in one industry control computer one small portable instrument.