IP telephone access system, customer's terminating device thereof and IP telephone access method

摘要

An IP telephone access system preventing the use of the 0AB-J number beyond the geographically identified area transfers an existing fixed telephone economically to an IP telephone without changing the telephone number. There is provided an address management table, in the ONU, coordinating the LLID and the address of the IP telephone terminal, an ID management table of the LLID of the ONUs included in the OLTs, and a subscriber's management table, in the IP network, coordinating the OLT-ID, the LLID, the IP address and the subscriber's number. The ONUs extract and store IP packets transmitted from the IP telephone to a server, and then, collate the IP packets with IP addresses transmitted and received, and in the case that these IP addresses are mismatched, transmit the abnormality notification to the server.