Subscriber module of isdn having a additional facsimile processing part

A subscriber module of an ISDN(Integrated Services Digital Network) having an additional facsimile processing part is provided to make it possible to process voice, data and a fax signal without a separate fax data processing module. A line interface part(11) provides an interface for voice, data and a fax signal. A control part(13) takes charge of overall control of a system. A memory part(14) stores a program that enables the control part to read and write a series of instructions. A switching part(15) switches the voice, the data and the fax signal to each part. A digital signal processing part(16) processes the voice and the fax signal. A fax signal processing part(17) processes fax data.