Information processing system and image forming apparatus

An information processing system which transmits and receives sound data through a switching equipment, comprising:

• a requesting side apparatus in which a facsimile function is implemented to transmit and receive communication sounds through the switching equipment;
• a reproduction side apparatus in which a facsimile function is implemented to transmit and receive communication sounds through the switching equipment;
• a storage which stores recording data which is sound data obtained by recording the communication sounds which have been transmitted and received in the past;
• a controller which generates a reproduction instruction command to reproduce the recording data through the switching equipment, and transmits the reproduction instruction command to the reproduction side apparatus;
• a sound reproducer which reproduces, when the reproduction side apparatus receives the reproduction instruction command, the recording data which is processed by sectioning, with a soundless period, a FAX terminal identification signal which is included in the recording data and provided for switching the operation mode of the switching equipment to a FAX mode, and transmits the recording data to the requesting side apparatus;
• wherein the processed recording data including the sectioned FAX terminal identification signal does not switch the operation mode of the switching equipment to the FAX mode;
• and
• a sound recorder which records the processed recording data which is reproduced by the sound reproducer.