Handsfree communication control method, portable radio communication apparatus and handsfree system

摘要

A channel disconnection detecting unit (301) detects whether a voice channel (6) is disconnected by an audio gateway AG (3) or by an handsfree apparatus HF (4). When the voice channel (6) is disconnected by the AG (3), an AG control unit (34) controls a modulation/demodulation unit (33) to maintain a connection of the AG (3) with a BS (2) and a switching unit (38) switches a voice signal to an AG speaker (36) and an AG microphone (37). When the voice channel (6) is disconnected by the HF (4), the AG control unit (34) controls the modulation/demodulation unit (33) to interrupt the connection of the AG (3) with the BS (2).