Communication line connecting adapter and communication line connecting method

A communication line connecting adapter which connects a public telephone line, an extension line, a VoIP (Voice over Internet Protocol) gateway and a modem/facsimile section and comprises:

• a first switch;
• a second switch;
• a third switch;
• a line which connects a common terminal of said first switch to said modem/facsimile section via a first DAA (Data Access Arrangement) circuit;
• a line which connects a zeroth node terminal of said first switch to said public telephone line and a common terminal of said second switch;
• a line which connects a first node terminal of said first switch to said VoIP gateway via an SLIC (Subscriber Line Interface Circuit);
• a line which connects said first node terminal of said first switch to a zeroth node terminal of said third switch;
• a line which connects a zeroth node terminal of said second switch to said VoIP gateway via a second DAA circuit;
• a line which connects a first node terminal of said second switch to a first node terminal of said third switch;
• and
• a line which connects a common terminal of said third switch to said extension line.

A communication line connecting adapter which connects a public telephone line, a VoIP (Voice over Internet Protocol) gateway and a modem/facsimile section and comprises:

• a first switch;
• a second switch;
• a line which connects a common terminal of said first switch to said modem/facsimile section via a first DAA (Data Access Arrangement) circuit;
• a line which connects a zeroth node terminal of said first switch to said public telephone line and a common terminal of said second switch;
• a line which connects a first node terminal of said first switch to said VoIP gateway via an SLIC (Subscriber Line Interface Circuit);
• and
• a line which connects a zeroth node terminal of said second switch to said VoIP gateway via a second DAA circuit.

A communication line connecting adapter which connects a public telephone line, a VoIP (Voice over Internet Protocol) gateway and a modem/facsimile section and comprises:

• means which connects said public telephone line to said VoIP gateway and said modem/facsimile section when there is an incoming call from said public telephone line;
• means which judges whether or not a control signal for initiating facsimile communication or modem communication has come from a calling party;
• means which disconnects said VoIP gateway from said public telephone line when it is judged that said control signal has come;
• and
• means which disconnects said modem/facsimile section from said public telephone line when it is judged that said control signal has not come yet.

A communication line connecting method which connects a public telephone line, a VoIP (Voice over Internet Protocol) gateway and a modem/facsimile section and comprises the steps of:

• connecting said public telephone line to said VoIP gateway and said modem/facsimile section when there is an incoming call from said public telephone line;
• judging whether or not a control signal for initiating facsimile communication or modem communication has come from a calling party;
• disconnecting said VoIP gateway from said public telephone line when it is judged that said control signal has come;
• and
• disconnecting said modem/facsimile section from said public telephone line when it is judged that said control signal has not come yet.