Patent ID: 7720512

Claim:
A radio apparatus connectable to a radio station via a first antenna and connectable to a hands-free apparatus via a second antenna, comprising: a first radio circuit configured to send and receive radio signals to and from the radio station via the first antenna; a second radio circuit configured to send and receive radio signals to and from the hands-free apparatus via the second antenna; and a controller configured to control the radio apparatus, wherein the controller is configured to execute: establishing a control channel with the hands-free apparatus via the second radio circuit and the second antenna, and switching to hands-free mode; sending an incoming call to the hands-free apparatus through the control channel if the incoming call is detected while the hands-free mode is set; measuring time to respond to the incoming call; activating a voice recording function automatically, so that a caller can leave a message, if the measured time reaches a predetermined time period and no signal for replying to the incoming call is received from the hands-free apparatus via the control channel, and waiting for the hands-free apparatus to reply via the control channel; establishing a voice channel with the hands-free apparatus via the second radio circuit and the second antenna if a signal for replying to the incoming call is received from the hands-free apparatus via the control channel while the voice recording function is activated; and transferring a voice from the radio station to the hands-free apparatus and a voice from the hands-free apparatus to the radio station if the voice channel is established.