Abstract: When a telephone number of a call destination is input from a source IP telephone apparatus, a NAPTR record of the call destination is obtained from an ENUM server, based on the input telephone number of the call destination. From the obtained NAPTR record, destination numbers and service names as the contact information for the call destination are retrieved and a list of contact information is displayed on its display. When one service name is selected from a list of service names displayed on the display, the selected service name is highlighted and a corresponding destination number is displayed. A call is then transmitted to a destination terminal based on a contact information entry selected from the displayed list of contact information entries.

Abstract: A source IP telephone apparatus obtains, from an ENUM server, NAPTR records of a call destination based on a telephone number of the call destination, the telephone number being input by dialing. The source IP telephone apparatus then selects, from the obtained NAPTR records, a NAPTR record to be used for transmitting a call, based on a priority order, and transmits a call to the call destination based on an access method and a destination number included in the selected NAPTR record. When a destination IP telephone apparatus is busy, the second priority NAPTR record is selected and another call is made by automatically switching the access method.

Abstract: A CPU executes a process for obtaining, from an ENUM server, a NAPTR record of a destination IP terminal by controlling an IP network controller when placing a call to the destination IP terminal, a process for determining whether the destination IP terminal has at least one communication function corresponding to the source IP terminal based upon the communication functions specified in the NAPTR record and a process for displaying, on a display, the at least one communication function that is determined to be stored in the destination IP terminal.

Abstract: A CPU of an IP telephone apparatus transmits, to an ENUM server, a message “Request the NAPTR record” corresponding to the destination terminal. The CPU also receives a message “Respond to the NAPTR information” in response to the message “Respond to the NAPTR record”. Further, the CPU automatically transmits, from a network I/F to the ENUM server, the request for the registration of information regarding the apparatus terminal when the switch is initially turned ON after the IP telephone apparatus is installed and connected to the IP network. The request for the registration is previously stored in a memory. The CPU also receives the message “Respond indicating completion of the registration” in response to the request for the registration.

Abstract: A CPU controls the entire operation of a CA based on a control program that is stored in a memory. When receiving, for example, from an IP telephone apparatus, a request (Register) to register a NAPTR record of a terminal apparatus, the CPU searches for corresponding user data from a user database, which is described later, sends the retrieved user data to a NAPTR data converter, and stores the converted NAPTR record on an ENUM server. In addition, the CPU functions as a registration processor.

Abstract: An IP telephone system includes a plurality of IP telephones and an ENUM server. The IP telephones are connected to an IP network and perform a mixing process on communication data output from other IP telephones. The ENUM server stores a NAPTR resource record specifying a number which identifies a telephone conference being conducted among these IP telephones and specifying identification information for another participating IP telephone, and transmits a corresponding NAPTR resource record in response to a query from the IP telephone. In the IP telephone system, one participating IP telephone transmits to the ENUM server a query for a NAPTR resource record by specifying the number which identifies the telephone conference, obtains identification information for another participating IP telephone according to the received NAPTR resource record, places a call based on the identification information and performs a mixing process on communication data output from other IP telephones.

Abstract: When a call recipient name is clicked on a search result screen of a phonebook search system, an ENUM server is notified of an html file name which displays the call recipient profile, which is personal data. The ENUM server extracts a URI corresponding to an IP telephone service for the call recipient from a NAPTR record based on the html file name, and transmits the URI to a source IP telephone apparatus. The source IP telephone apparatus then becomes able to place a call to a destination IP telephone apparatus, using the URI corresponding to the IP telephone service for the call recipient.

Abstract: A CPU in an IP telephone apparatus automatically controls to transmit, from a network I/F to an ENUM server, a request for deleting a NAPTR record when an absent key is pressed. The CPU regularly transmits, from the network I/F to the ENUM server, an inquiry for a NAPTR record of another IP telephone apparatus. When the CPU receives, from the ENUM server via the network I/F, a response indicating that the NAPTR record of another IP telephone apparatus has been deleted, in response to the inquiry, the CPU turns OFF a lamp indicating that the user is available.

Abstract: When a CPU receives, from a source IP telephone apparatus, a request “Register (Unregister)” for deleting a NAPTR record, or when the reception of the request “Register” for registering the NAPTR record that is regularly received from the source IP telephone apparatus is suspended, the CPU refers to the user data stored in a user database, and transmits, to an ENUM server, a request for deleting the NAPTR record of the source IP telephone apparatus. Further, when a request for the NAPTR record of the source IP telephone apparatus is regularly received from a destination IP telephone apparatus via a network interface and when the deletion process of the NAPTR record is completed, the CPU returns, to the destination IP telephone apparatus, a response indicating that the NAPTR record of the source IP telephone apparatus is deleted.

Abstract: An IP telephone system includes a source IP telephone apparatus, a Web server and an ENUM server. The source IP telephone apparatus is connected to an IP network. The Web server stores predetermined information regarding a user of the source IP telephone apparatus and transmits, to a destination IP telephone apparatus, the predetermined information in response to a request from the destination IP telephone apparatus. The ENUM server stores a NAPTR resource record which includes a URI utilized for obtaining the predetermined information stored in the Web server. In the IP telephone system, the destination IP telephone apparatus transmits, to the ENUM server, a request for a NAPTR resource record of the source IP telephone apparatus and transmits, to the Web server, a request for the predetermined information regarding the source IP telephone apparatus according to the obtained NAPTR resource record.

Abstract: An IP telephone system includes an IP telephone apparatus, a Web server and an ENUM server. The IP telephone apparatus is connected to an IP network. The Web server registers talk volume information corresponding to a telephone number assigned to the IP telephone apparatus. The ENUM server registers a NAPTR resource record in which a URI specifies link data related to the talk volume information registered in the Web server. In the IP telephone system, the IP telephone apparatus that has received a call transmits, to the ENUM server, a query for a NAPTR record corresponding to a targeted recipient phone number. The IP telephone apparatus then transmits, to the Web server, a request for the talk volume information corresponding to the targeted recipient phone number according to the returned NAPTR resource record, and adjusts the talk volume according to the returned talk volume information.

Abstract: An ENUM system includes a Web server and an ENUM server. The Web server stores first NAPTR records corresponding to an ENUM client and another ENUM client on an IP network. The ENUM server stores second NAPTR records in which first URIs are associated with predetermined information for being linked to the Web server. In the ENUM system, the ENUM client transmits, to the ENUM server, a query for the second NAPTR record of the another ENUM client. The ENUM client then transmits, to the Web server, a request for access to the first URI included in the received second NAPTR record, and obtains the first NAPTR record corresponding to the another ENUM client.

Abstract: An IP telephone system includes a plurality of IP telephone apparatuses connected to an IP network, and an ENUM server. The ENUM server stores a NAPTR resource record specifying a number which identifies a telephone conference being conducted among these IP telephone apparatuses and specifying identification data for an IP telephone apparatus that attends the telephone conference. The ENUM server also transmits a corresponding NAPTR resource record in response to a query from an IP telephone apparatus. In the IP telephone system, one participating IP telephone apparatus transmits, to the ENUM server, a query for a NAPTR resource record by specifying the number which identify the telephone conference and obtains identification data for another participating IP telephone apparatus according to the received NAPTR resource record.

Abstract: An ENUM server stores NAPTR records including PSTN telephone numbers and the corresponding IP telephone numbers of a source IP telephone apparatus and a destination IP telephone apparatus. When the ENUM server receives an ENUM query from the source IP telephone apparatus, the ENUM query setting a domain name based on the PSTN telephone number, the ENUM server searches for a NAPTR record corresponding to the domain name and returns, to the source IP telephone apparatus, an ENUM response including the NAPTR record. When receiving the ENUM response from the ENUM server, the source IP telephone apparatus retrieves the IP telephone number of the destination IP telephone apparatus, the IP telephone number being specified in the NAPTR record contained in the ENUM response, and starts a call connection sequence with the destination IP telephone apparatus.

Abstract: An IP telephone system includes an IP telephone apparatus that performs voice communication via an IP network or a PSTN, a carrier that manages the voice communication performed by the IP telephone apparatus via the IP network and a server that returns a NAPTR resource record in response to a request from the IP telephone apparatus. In the IP telephone system, when the IP telephone apparatus performs the voice communication, the IP telephone apparatus transmits, to the server, a request for a NAPTR resource record corresponding to a destination IP telephone apparatus, chooses either the IP network or the PSTN as a communication path according to the received NAPTR resource record and performs the voice communication.

Abstract: An IP telephone system comprises an IP telephone that performs voice communication via an IP network, a carrier that manages voice communication for the IP telephone via the IP network and a server that returns NAPTR resource record(s) in response to a request from the IP telephone. In the IP telephone system, when the IP telephone performs voice communication via the IP network, the IP telephone transmits, to the server, a request for NAPTR resource record(s) that correspond(s) to the telephone number of the destination terminal. When NAPTR resource record(s) is(are) stored, voice communication is directly performed between the IP telephone and the destination terminal via the IP network according to the NAPTR resource record. On the other hand, when NAPTR resource record(s) is(are) not stored, the carrier manages calls, and voice communication is performed between the IP telephone and the destination terminal via the IP network.

Abstract: An Internet telephone system that stores NAPTR resource records which include URIs corresponding to the phone numbers of individual terminals (Internet telephones), as well as IP addresses that correspond to those URIs. The system uses a server that stores a plurality of URIs corresponding to telephone numbers of terminals adjacent to a particular telephone, and uses a terminal that receives, from the sever, URI(s) and other information corresponding to an input telephone number, and places calls to destinations. In the Internet telephone system according to the present invention, the sever returns a plurality of URIs in response to requests, from the terminal, for URIs corresponding to a particular telephone number, and the terminal places a call to a destination corresponding to one of these URIs. When no connection is possible with the destination, a different URI is selected, and another call is placed to a destination corresponding to the different URI.

Abstract: An internal terminal that connects to a DNS server, the server storing and managing a telephone number for communication and an external NAPTR record, the internal terminal including: a terminal communication controller that accesses the DNS server and notifies the DNS server of a telephone number for the communication; a terminal-side controller that obtains, when the DNS server is informed of the communication telephone number, an external NAPTR record being corresponding to the communication telephone number; an IP service presence determination unit that determines whether the external NAPTR record has function service information related to IP communication; and a display that displays the available IP communication service function of the destination corresponding to the communication telephone number, when it is determined that the external NAPTR record has the IP communication service function.

Abstract: A home gateway apparatus is connected to a DNS server that stores and manages telephone numbers and an external NAPTR record corresponding to each telephone number. The home gateway apparatus also includes and mutually connects a plurality of internal terminals. The home gateway apparatus includes an NAPTR record generator that generates an internal NAPTR record of all internal terminals; an internal NAPTR memory area that stores the generated internal NAPTR record; an external NAPTR memory area that stores an external NAPTR record, which is selected from the internal NAPTR record to be allowed to be disclosed to the DNS server; and a self NAPTR record notification unit that notifies the DNS server of the external NAPTR record so that the DNS server can register the external NAPTR record in association with a telephone number.

Abstract: An internal terminal that connects to a DNS server, the server storing and managing a telephone number and an external NAPTR record, the internal terminal including a terminal communication controller that accesses the DNS server and notifies the DNS server of a telephone number for an inquiry; a terminal-side controller that obtains, when the DNS server is informed of the inquiry telephone number, an external NAPTR record being corresponding to the inquiry telephone number; and a display that displays destination service functions selected from the obtained external NAPTR record.