Facsimile apparatus

A facsimile apparatus connected to an ISDN, comprising:

• first communication means for communicating with G4 facsimile apparatus via the ISDN in G4 facsimile mode;
• second communication means for communicating with G3 facsimile apparatus via the ISDN in G3 facsimile mode;
• changeover means for changing over between an automatic mode to communicate automatically in response to a call received from the ISDN and a manual mode to communicate manually in course of manual instructions;
• detecting means for detecting whether or not a signal received via a B channel comes from G3 facsimile apparatus;
• and
• control means for selecting said second communication means to communicate in G3 facsimile mode in spite of the mode set by said changeover means, when it is detected by said detecting means that said signal comes from G3 facsimile apparatus.

A facsimile apparatus connected on an ISDN in a communication network in which the ISDN is connected to a telephone network, comprising:

• network identifying means for identifying whether an incoming data sending party is an ISDN terminal or a telephone network terminal on basis of a signal via a D channel;
• CNG signal detecting means for detecting a CNG signal from a signal received via a B channel in order to decide whether or not the incoming data sending party is a G3 facsimile apparatus;
• and
• changeover means for changing over between automatic reception and manual reception;
• when it is identified by said network identifying means that the incoming data sending party is a telephone network terminal, response being made in a facsimile mode in a case where said CNG signal is detected, in the facsimile mode if automatic reception is in effect in a case where said CNG signal is not detected, and in a telephone mode if manual reception is in effect in a case where said CNG signal is not detected.