| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a mobile communication system capable of reducing the battery consumption of a mobile station during waiting, making a communication even between different providers, and specifying a caller at a callee side. <P>SOLUTION: A caller side mobile station 100 requests voice communication using a VoIP through an IP network 301 to a center apparatus 400 by designating a telephone number M2 of a called side mobile station 200 and in response to this request, the center apparatus 400 calls the mobile station 200 via a line switched network 500 and notifies the mobile station 200 of a telephone number M1 and an IP address IP1 of the mobile station 100 via UUI information. In response to this notification, the mobile station 200 notifies a user of from whom call arrival occurs based on the notified telephone number M1 of the mobile station 100 and establishes a voice communication link for performing voice communication with the mobile station 100 using the VoIP via IP networks 302, 301 based on the IP address IP1 of the mobile station 100, thereby performing voice communication using the VoIP. <P>COPYRIGHT: (C)2007,JPO&INPIT |
