Patent ID: 7508819

Claim:
An Internet telephone apparatus connected to a server apparatus, the server apparatus storing a NAPTR (Naming Authority Pointer) resource record in which an ENUM domain name corresponds to a plurality of URIs, the server apparatus storing a plurality of IP addresses corresponding to the plurality of the URIs, the Internet telephone apparatus comprising: a key pad configured to input a telephone number of a call destination, a plurality of telephone apparatuses being associated with the call destination; a controller configured to generate an ENUM domain name based on the input telephone number, to transmit the generated ENUM domain name to the server apparatus, to receive the plurality of the URIs corresponding to the ENUM domain name from the server apparatus, to transmit one URI of the plurality of the received URIs to the server apparatus, to receive one IP address corresponding to the transmitted one URI from the server apparatus, and to access one of the plurality of the telephone apparatuses associated with the call destination for a call via the Internet, based on the one IP address, the controller, when the accessed one of the plurality of the telephone apparatuses is unavailable, being further configured to transmit another URI of the plurality of the URIs to the server apparatus, to receive another IP address corresponding to the another URI from the server apparatus, to automatically access another telephone apparatus of the plurality of the telephone apparatuses associated with the call destination for a call via the Internet, based on the another IP address.