Patent ID: 7295858

Claim:
A mobile unit for communicating with a base station, the base station allocating a traffic channel and a control channel after receiving a communication request, the mobile unit comprising: a phone speaker; a ringing speaker; a receiver receiving an incoming call signal via the control channel, and an audio data via the traffic channel; a switching device coupled to the receiver, configured to receive the audio data and selectively transmit the audio data to the phone speaker and the ringing speaker; and a micro-controller coupled to the switching device, after receiving the incoming call signal, the micro-controller configured to control the switching device to receive the audio data via the audio channel and concurrently transmit the audio data to the ringing speaker before the incoming call is answered, and after receiving a signal for answering the incoming call signal, the micro-controller configured to control the switching device to transmit the audio data to the phone speaker.