Communication terminal device

A communication terminal device connected to a communication network via communication lines in which at least two information channels used for transfer of switching information such as line switching information or packet switching information and a signal channel used for control of calling an objective communication terminal are disposed, comprising:

• a communication function control unit operative in a G4 facsimile mode;
• a communication function control unit operative in a G3 facsimile mode;
• a handset for making a voice communication;
• a first and a second CODEC disposed in a first and second information channel, respectively, in the communication lines for encoding and converting switching information, sent from the handset or the communication function control unit operative in the G3 facsimile mode to the respective information channels, to digital signals, and decoding and converting the switching information received from the respective information channels to analog signals;
• and
• an analog switch disposed among the handset and the communication function control unit operative in the G3 facsimile mode and the first and second CODECs and controlled so as to render conductive the signal path between the second CODEC corresponding to the second information channel and the communication function control unit operative in the G3 facsimile mode when there is an incoming telephone call or an originating telephone call in the second information channel during communication of image information in the G4 facsimile mode in the first information channel, the incoming telephone call or originating telephone call being a request for receipt or transmission of image information in the G3 facsimile mode.

A communication terminal device connected to a communication network via communication lines in which at least two information channels used for transfer of switching information such as line switching information or packet switching information and a signal channel used for control of calling an objective communication terminal are disposed, comprising:

• a communication function control unit operative in a G4 facsimile mode;
• a communication function control unit operative in a G3 facsimile mode;
• a handset for making a voice communication;
• a first and a second CODEC disposed in a first and second information channel, respectively, in the communication lines for encoding and converting switching information, sent from the handset or the communication function control unit operative in the G3 facsimile mode to the respective information channels, to digital signals, and decoding and converting the switching information received from the respective information channels to analog signals;
• and
• an analog switch disposed among the handset and the communication function control unit operative in the G3 facsimile mode and the first and second CODECs and controlled so as to render conductive the signal path between the handset and the first CODEC corresponding to the first information channel during communication through the handset in the first information channel, and controlled so as to render conductive the signal path between the second CODEC corresponding to the second information channel and the communication function control unit operative in the G3 facsimile mode while maintaining the conductive state between the first CODEC and the handset when there is an incoming telephone call in the second information channel during telephone communication, the incoming telephone call being a request for receipt of image information in the G3 facsimile mode.

A communication terminal device connected to a communication network via communication lines in which at least two information channels used for transfer of switching information such as line switching information or packet switching information and a signal channel used for control of calling an objective communication terminal are disposed, comprising:

• a communication function control unit operative in a G4 facsimile mode;
• a communication function control unit operative in a G3 facsimile mode;
• a handset for making a voice communication;
• a first and second CODEC disposed in a first and a second information channel, respectively, in the communication lines for encoding and converting switching information, sent from the handset or the communication function control unit operative in the G3 facsimile mode to the respective information channels, to digital signals, and decoding and converting the switching information received from the respective information channels to analog signals;
• and
• an analog switch disposed among the handset and the communication function control unit operative in the G3 facsimile mode and the first and second CODECs and controlled so as to render conductive the signal path between the handset and the first CODEC corresponding to the first information channel during communication through the handset in the first information channel, and controlled so as to temporarily release the conductive state between the handset and the first CODEC and render conductive the signal path between the handset and the second CODEC corresponding to the second information channel, the communication function control unit being operative in the G3 facsimile mode while maintaining the conductive state between the first CODEC and the handset when there is an incoming telephone call in the second information channel during the telephone communication, the incoming telephone call being a request for telephone communication with the communication terminal device.

A communication terminal device connected to a communication network via communication lines in which at least two information channels used for transfer of switching information such as line switching information or packet switching information and a signal channel used for control of calling an objective communication terminal are disposed, comprising:

• a communication function control unit operative in a G4 facsimile mode;
• a communication function control unit operative in a G3 facsimile mode;
• a handset for making a voice communication;
• an automatic answering telephone function unit;
• a first and a second CODEC disposed in a first and second information channel, respectively, in the communication lines for encoding and converting switching information, sent from the handset, the communication function control unit operative in the G3 facsimile mode, or the automatic answering telephone function unit to the respective information channels, to digital signals, and decoding and converting the switching information received from the respective information channels to analog signals;
• and
• an analog switch disposed among the handset, the communication function control unit operative in the G3 facsimile mode and the automatic answering telephone function unit, and the first and second CODECs and controlled so as to render conductive the signal path between the handset and the first CODEC corresponding to the first information channel during communication through the handset in the first information channel, and controlled so as to render conductive the signal path between the second CODEC corresponding to the second information channel and the automatic answering function unit while maintaining the conductive state between the first CODEC and the handset when there is an incoming telephone call in the second information channel during the telephone communication, the incoming telephone call being a request for telephone communication with the communication terminal device.