| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an IP telephone communication device that executes SIP communications for reducing a processing load of a SIP server. <P>SOLUTION: The IP telephone communication device transmits a communication request, including a telephone number of a communication destination, to a SIP server so as to execute communication with a communication-destination IP telephone communication device via the SIP server. The device stores the telephone number and the IP address corresponding to the telephone number transmitted from the SIP server in its own storage part so as to determine whether the IP address, corresponding to the inputted telephone number, is stored in its own storage part. When stored, the device reads out the IP address, corresponding to the telephone number, from the storage part and transmits a communication request by using the read IP address as the communication destination so as to execute communication with the communication-destination IP telephone communication device. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
