Patent ID: 8045541

Claim:
An Internet Protocol (IP) telephone system, comprising: a call originating IP telephone apparatus that is connected to an IP network; a call receiving IP telephone apparatus that is connected to the IP network, a plurality of concurrently active telephone numbers being assigned to the call receiving IP telephone apparatus; a Web server that stores call reception screen information corresponding to each of the plurality of concurrently active telephone numbers assigned to the call receiving IP telephone apparatus, and transmits to the call receiving IP telephone apparatus the call reception screen information that corresponds to an intended recipient telephone number of the plurality of concurrently active telephone numbers as a response to a request from the call receiving IP telephone apparatus; and a Telephone Number Mapping (ENUM) server that stores a plurality of Naming Authority Pointer (NAPTR) resource records for a given ENUM domain name, in which a Uniform Resource Identifier (URI) of one of the plurality of NAPTR resource records specifies link information for the call reception screen information stored in the Web server, and transmits a NAPTR resource record to the call receiving IP telephone apparatus in response to a query from the call receiving IP telephone apparatus, wherein at a period from a reception by the call receiving IP telephone apparatus of an INVITE message according to Session Initiation Protocol (SIP) to sounding a ring tone, the call receiving IP telephone apparatus extracts a called intended recipient telephone number from the received INVITE message; generates, upon reception of a call for the intended recipient telephone number of the plurality of concurrently active telephone numbers assigned to the call receiving IP telephone apparatus, an ENUM domain name from the called intended recipient telephone number; transmits a query to the ENUM server that queries for the generated ENUM domain name of an NAPTR resource record comprising the URI corresponding to the call reception screen information for the called intended recipient telephone number; transmits a request to the Web server for requesting call reception screen information that corresponds to the called intended recipient telephone number, wherein the request includes the URI corresponding to the call reception screen information and wherein the URI is obtained from the queried NAPTR resource record; and displays a call reception screen with obtained call reception screen information that corresponds to the intended recipient telephone number.