Abstract: A method of processing a call back message in a facsimile system performing a voice communication function after communication of the image data is completed. A ring signal is generated in response to reception of a voice communication request signal requesting for a voice communication after completion of the image data communication. If the intended recipient of the receiving facsimile system is not available to answer the voice communication request, identification information of a counterpart's facsimile system and communication time are stored in a memory for a visual display in order to inform the intended recipient to call back at some later time.