COMMUNICATION DEVICE, METHOD, AND SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a communication device that makes a telephone call over IP through easy operation. SOLUTION: An IP mobile phone terminal 10 making a telephone call over IP to an opposite telephone set 60 through a radio communication system 20A including a radio base station and the Internet 30 includes a telephone call request means of transmitting the telephone number of the opposite telephone set 60 to the radio base station by radio to request a telephone call over IP with the opposite telephone set 60 and a telephone call means of making the telephone call over IP with the opposite telephone set 60 through the radio communication system 20 and the Internet 60 when the radio communication system 20A of the radio base station that the telephone call over IP is requested of calls the opposite telephone set 60 through the Internet 30 and the opposite telephone set 60 makes an answer responding to the calling processing through the Internt 30 and radio communication system 20A. COPYRIGHT: (C)2007,JPO&INPIT