The disclosure provides a mobile terminal, comprising: a fixed network access control module, configured to connect mobile terminal with analogue subscriber line and notify central processor that the mobile terminal is connected with fixed telephone network when analogue subscriber line is connected with analogue subscriber line interface, a frequency shift keying processing module, configured to identify the signaling from the analogue subscriber line, then send the signaling to the central processor, and to identify the signaling from the central processor, and then send the signaling to the analogue subscriber line, a call processing module, configured to extract the voice signal from the analogue subscriber line and send the voice signal to the voice output device of the mobile terminal to be played, and send the voice signal from the user to the analogue subscriber line, a mobile communication module, and a central processor.