| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable discrimination on the possibility of P2P (peer-to-peer) communication by an IPv6 address in an IP telephone system that provides a data connect service using an IPv4 protocol. <P>SOLUTION: In an IP telephone device 100, after exchanging a notification and a response of the IPv6 address with an opposite IP telephone device in a data connect session, IPv6 communication test means 118 performs a communication test with the opposite IP telephone device by the P2P communication. If the communication test fails, the IP telephone device 100 exchanges the notification and the response of the IPv4 address, and acquires the IPv4 address of the opposite IP telephone device to store it into acquisition protocol information storage means 119, and then completes the data connect session. Thereafter, based on the acquired IPv4 address, the IP telephone device 100 transmits and receives data with the opposite IP telephone device through an IPv4 network by the P2P communication. <P>COPYRIGHT: (C)2013,JPO&INPIT |
