In-vehicle apparatus having handsfree function

An in-vehicle apparatus having a handsfree function, comprising:

• a connection section configured to establish connection with a plurality of cellular phones at a same time using a handsfree communication protocol for handsfree communication, each cellular phone being configured to be operable in a calling state when the each cellular phone is receiving an incoming call, each cellular phone being further configured to be selectively operable in one of:
• a handsfree communicating state where a voice path between the each cellular phone and the connection section is open so that a first outgoing voice inputted via a voice input device of the in-vehicle apparatus is transmitted toward a party and a first incoming voice transmitted from the party is output by a voice output device of the in-vehicle apparatus;
• and
• a handset communicating state where the voice path between the each cellular phone and the connection section is closed so that a second outgoing voice inputted via a voice input part of the each cellular phone is transmitted toward the party and, a second incoming voice transmitted from the party is outputted by a voice output part of the each cellular phone;
• and
• a controller configured to provide:
• a transfer item that is user operable to switch a first cellular phone from the handset communicating state into the handsfree communicating state, the first cellular phone being one of the cellular phones connected with the connection section and being in the handset communicating state;
• and
• an answer item that is user operable to switch a second cellular phone from the calling state into the handsfree communication so that response to the incoming call of the second cellular hone is performed in the handsfree communication, the second cellular phone being another one of the cellular phones connected with the connection section and being in the calling state,
• the controller being further configured to prohibit the transfer item for the first cellular phone from being provided and allow the answer item for the second cellular phone to be provided if the first cellular phone and the second cellular phone are respectively and simultaneously in the handset communicating state and in the calling state.