ADSL COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To provide an ADSL communication system, in which while an ADSL communication line is being used, a reception from an outside is denied because of such a reason why a line of 4 kHz or less is being used, whereby the ADSL line which is being used is not disconnected. SOLUTION: It is determined whether or not an IP telephone is being used, and when the IP telephone is being used, it is determined whether or not an analog telephone device B ahead of a splitter 105 is being used. When it is not used, it is determined whether or not a mating calling number to be called from a dialing unit while the IP telephone is being used is registered. When it is registered, a line is closed for calling, and a history of calls is stored. When the IP telephone is not used, it is determined whether or not the history of the call by the dialing unit exists. When the history of the call exists, the line is opened to clear the history of the call. COPYRIGHT: (C)2006,JPO&NCIPI