| 摘要 |
When a call is issued from a first analog telephone set (101S) to a second analog telephone set (101R) by utilizing a public telephone line network (107), a second Internet connecting device (103R) senses an incoming call, then stores a telephone number of the first analog telephone set (101S), and then sends out a sender-side telephone number and a receiver-side telephone number as an IP packet to the Internet (105) to direct to a predetermined multicast address. A first Internet connecting device (103S) disconnected the calling when it receives the IP packet, then both Internet connecting devices (103S), (103R) are caused to recognize sender-side and receiver-side IP addresses by transmitting the IP packet to a destination-side IP address via the Internet (105), and thus a voice talking via the Internet (105) is established. Accordingly, the Internet phone system can be built up with a simpler means structure and also a voice quality can be maintained.
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