Communication apparatus and control method therefor

摘要

This invention provides a communication apparatus (100, 700), which suppresses abrupt changes of a current and voltage generated in a communication line upon connecting an external telephone to the communication line, and a control method thereof. To accomplish this, in a communication apparatus (100, 700) of this invention, when an off-hook state of an external telephone (128) is detected upon connecting the external telephone to a communication line (130), an SOC (101) captures a line using a first line capture means (105) having an impedance lower than the external telephone side, and then switches an H-relay (110) to connect the external telephone to the communication line. Furthermore, the SOC (101) temporarily switches a line capture state to a second line capture means (106) having an impedance higher than the first line capture means after the H-relay is switched and before the line is released.