Patent ID: 8447029

Claim:
A communication apparatus, which comprises a connection unit that an external telephone is connected to, a switching unit that switches between a connection state in which the external telephone is connected to a line and a disconnection state in which the external telephone is disconnected from the line, a detection unit that detects an off-hook state of the external telephone, and a network control unit that is connected to the line in parallel to the external telephone, and controls a capture state of the line, said apparatus comprising: a first capture control unit that captures, when the detection unit detects the off-hook state of the external telephone in the disconnection state, the line using a first line capture unit, an impedance of which is lower than the external telephone side, and which is included in the network control unit; a connection control unit that connects the external telephone to the line by switching the switching unit to the connection state after the first line capture unit captures the line; a second capture control unit that captures the line by switching to a second line capture unit, an impedance of which is higher than the first line capture unit and which is included in the network control unit, after the external telephone is connected to the line; and a line release unit that releases the capture state of the line by the second line capture unit after the second line capture unit captures the line.