Patent ID: 8165625

Claim:
A mobile communication apparatus performing group communication between a cellular communication system and a VoIP system, comprising: a first wireless communication module for processing signals of a cellular network corresponding to the cellular communication system; a second wireless communication module for processing signals of a wireless local area network (WLAN) corresponding to the Voice over Internet Protocol (VoIP) system; and a control module, coupled to the first wireless communication module and the second wireless communication module, for establishing voice communications with the cellular network and the WLAN through the first wireless communication module and the second wireless communication module, and for exchanging signals of the first wireless communication module and the second wireless communication module when the mobile communication apparatus operates in a first operation mode; wherein the control module establishes voice communications with the cellular network through the first wireless communication module and establishes voice communications with the WLAN through the second wireless communication module, and signals of the first wireless communication module are transferred to the WLAN through the second wireless communication module and signals of the second wireless communication module are not transferred to the cellular network when the mobile communication apparatus operates in a fifth operation mode; wherein the control module establishes voice communications with the cellular network through the first wireless communication module and establishes voice communications with the WLAN through the second wireless communication module, and signals of the second wireless communication module are transferred to the cellular network through the first wireless communication module and signals of the first wireless communication module are not transferred to the WLAN when the mobile communication apparatus operates in a sixth operation mode.