| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for connecting with Internet by a user in advance and also makes a gateway unnecessary. SOLUTION: After a calling-side terminal device 23 sends a connection request for Internet telephone to a called-side terminal device 24 through a telephone line 25 and the called-side terminal device 24 sends connection acknowledgement to the calling-side terminal device 25 through the telephone line 25 in response, the terminal devices 23 and 24 connects to the Internet 28 through RASs 26 and 27. Then the calling-side terminal device 23 and called-side terminal device 24 informs each other of their IP addresses through the telephone line 25 to establish a call connection over the Internet.
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