| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication apparatus which suppresses abrupt changes of a current and a voltage generated in a communication line when connecting an external telephone to the communication line, and to provide a control method thereof. SOLUTION: In the communication apparatus, when the off-hook state of an external telephone is detected upon connecting the external telephone to a communication line, an SOC captures a line using a first line capture means 1 having impedance lower than that at the external telephone side, and then switches an H-relay to connect the telephone to the communication line. Furthermore, the SOC temporarily switches a line capture state to a second line capture means 2 having impedance higher than that of the first line capture means 1 after the H-relay is switched and before the line is released. COPYRIGHT: (C)2011,JPO&INPIT |
