Internet telephone network system, network access method and talking device adapter

Once with with the voice-over-IP adapter of the existing telephone connected; when it is cut by voice-over-IP the common line it is the problem that the normal telephones telephone. And call adaptor device of IP network connection with the common wire, comprising a common signal transceiving part 1100 input and a sheets from the telephone 10 call information, the object connecting part and 200 obtain with the IP address of the whether a communication, generating routing information, after the routing information to the wire connection switching part 100. Wire connection part and 100 automatically according to the routing information selecting of 13 line respectively from the IP network communication processing part 5000 in random manner via IP network 14 groove, after the call information to telephone 20.