Facsimile communication apparatus and control method thereof

A method of controlling a facsimile communication apparatus for receiving image data via a telephone public circuit network, the method comprising:

• detecting, by a first detection unit of the facsimile communication apparatus, a call signal from the telephone public circuit network;
• capturing, by a line capturing unit of the facsimile communication apparatus, the telephone public circuit network in response to that the first detection unit has detected the call signal;
• detecting, by a second detection unit of the facsimile communication apparatus, that a voltage value applied from the telephone public circuit network has exceeded a predetermined threshold after the line capturing unit has captured the telephone public circuit network;
• executing, by a protection unit of the facsimile communication apparatus, a protection function of protecting the facsimile communication apparatus from a voltage applied from the telephone public circuit network in response to that the second detection unit has detected that a voltage value applied from the telephone public circuit network has exceeded the predetermined threshold;
• and
• controlling, by a control unit of the facsimile communication apparatus, the protection unit to switch to an OFF state in which the protection function is not executed, after the line capturing unit captures the telephone public circuit network and before image data is received from another facsimile communication apparatus which has generated the call signal.