Patent ID: 8457030

Claim:
A mobile phone, comprising: at least one processor; a storage system; one or more programs that are stored in the storage system and are executed by the at least one processor, the one or more programs comprising: a mobile communication module operable to register with a session initiation protocol (SIP) server by use of a first Internet protocol (IP) address and a voice over Internet protocol (VoIP) account over a mobile communication network, and enter a suspension mode when the mobile communication module has successfully registered with the SIP server and has no communication; and a wireless communication module operable to register with the SIP server by use of a second IP address and the VoIP account over a wireless communication network, and enter a suspension mode when the wireless communication module has successfully registered with the SIP server and has no communication; wherein when a remote phone calls the VoIP account to the SIP server, the SIP server transmits an SIP invite to both the mobile communication module and the wireless communication module over the mobile communication network and the wireless communication network, respectively, according to the VoIP account, the first IP address, and the second IP address; wherein the wireless communication module receives the SIP invite over the wireless communication network, and wakes up the mobile communication module according to the SIP invite; wherein when waked up, the mobile communication module transmits an SIP response to the SIP server over the mobile communication network, so as to inform the SIP server that the mobile communication module has received the call from the remote phone over the mobile communication network.