| 摘要 |
There are provided an IP telephone system and method for establishing a connection to the IP network 4 via a public line network and performing talking by transmitting/receiving IP packet data into which audio data has been converted. In a location server 3 arranged on a PSTN 5 or the IP network 4, a public line telephone number and an IP telephone number which are attached to the line connected to a telephone terminal 1a and a terminal identifier identifying the telephone terminal 1a are registered while correlating them to each other. When an IVR 8 is called, the public line telephone number, the IP telephone number of the telephone terminal 1a and/or the terminal identifier is acquired from the telephone terminal 1a and the registration content in the location server 3 is modified via a registrar system 7.
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