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 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: 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: 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 IP telephone system includes IP telephone apparatuses and an ENUM server. The IP telephone apparatuses, connected to an IP network, perform a voice communication. The ENUM server stores NAPTR resource records containing file transfer protocols supported by the IP telephone apparatuses and returns the NAPTR resource records, responding to a query of the IP telephone apparatuses. In the IP telephone system, when receiving a voice communication instruction from a user of a source IP telephone apparatus the source IP telephone apparatus inquires the ENUM server for NAPTR resource records of a destination IP telephone apparatus. When receiving a file transfer instruction during a voice communication, the source IP telephone apparatus transfers a file to the destination IP telephone apparatus, using a file transfer protocol specified in the NAPTR resource records.

Abstract: An IP telephone number query system includes a terminal, a Web server, and an ENUM server. The terminal displays a call recipient profile hypertext markup language (html) that is assigned a HTML document file name. The Web server includes a phonebook searcher that has a plurality of call recipient profile htmls, and returns a selected call recipient profile html in response to a request from the terminal. The ENUM server has a database, a query issuer and a reversed query issuer. The database stores a plurality of NAPTR resource records in association with an ENUM domain name, each NAPTR resource record containing a URI that at least includes a telephone number and a HTML document file name. The query issuer searches the database in response to a query by an ENUM domain name and returns a NAPTR resource record corresponding to the ENUM domain name.

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: 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.

Abstract: Upon receiving, from a source IP terminal, a DNS packet that includes destination NAPTR query data with a keyword, an ENUM server compares the keyword with a keyword of a destination IP terminal stored in a keyword database. When the keywords are identical, the ENUM server generates a reply packet that includes NAPTR records, excluding the keyword, of the destination IP terminal registered in the NAPTR database. When the keywords are not identical, on the other hand, the ENUM server generates a reply packet indicating “No corresponding data.” Then, the ENUM server returns the generated reply packet to the source IP terminal.

Abstract: When an operator of an Internet telephone inputs a telephone number, a server provides an IP address corresponding to the telephone number. Upon receiving the IP address and confirming a predetermined symbol in a host address portion of the IP address, the predetermined symbol is converted into a numeric value. Based on the converted IP address, a call destination is accessed. When the call destination is unavailable, the converted numeric value is incremented in order to generate another IP address. Then, the newly generated IP address is used to access another destination.

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: A network address of a network to which an Internet telephone is connected is registered in a RAM. When an operator inputs an extension number of a destination terminal (an Internet telephone) that is connected to the same network, a CPU combines the registered network address in the RAM and the input extension number in order to generate an IP address. Based on this IP address, a call is placed to the destination terminal (the Internet telephone) of the extension number.

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: In a NAT type determination method pursuant to RFC 3489, address information added in a binding response from a STUN server in response to a binding request issued in a latest transmission test is compared with address information added in a binding response in response to any transmission test executed therebefore. When the address information are not identical, a NAT type is determined symmetric. Even when a router whose NAT type changes frequently according to a use status is connected, communication is capable without manual setting change by a user.

Abstract: An IP terminal apparatus has a SIP controller, a UDP packet controller, and an RTP controller. The SIP controller transmits and receives a call control message in order to establish a connection to and from a destination apparatus. The UDP packet controller transmits and receives media data with the destination apparatus in a media session after the connection was established. The RTP controller obtains source port number information of a media data packet that the UDP packet controller has received from the destination apparatus, and sets the obtained source port number as a destination port number for a packet to be transmitted to the destination apparatus. Thereby, a feasible range of NAT traversal can be improved in a simple and secure manner, even when at least one relay apparatuses employs symmetric NAT.

Abstract: An IP telephone system includes IP telephone apparatuses and an ENUM server. The IP telephone apparatuses, connected to an IP network, perform a voice communication. The ENUM server stores NAPTR resource records containing file transfer protocols supported by the IP telephone apparatuses and returns the NAPTR resource records, responding to a query of the IP telephone apparatuses. In the IP telephone system, when receiving a voice communication instruction from a user of a source IP telephone apparatus the source IP telephone apparatus inquires the ENUM server for NAPTR resource records of a destination IP telephone apparatus. When receiving a file transfer instruction during a voice communication, the source IP telephone apparatus transfers a file to the destination IP telephone apparatus, using a file transfer protocol specified in the NAPTR resource records.

Abstract: An IP telephone apparatus is connected to an ENUM server and a Web server via an IP network. The ENUM server has a database that stores an IP telephone URI as terminal information of the IP telephone apparatus and a Web server URI corresponding to the IP telephone apparatus. The Web server stores image data captured by a camera. The IP telephone apparatus transmits to the ENUM server a query on terminal information of a destination IP telephone apparatus; receives from the ENUM server the terminal information of the destination IP telephone apparatus; acquires from the received terminal information a Web server URI corresponding to the destination IP telephone apparatus and performs visual communication with the Web server based on the Web server URI; and displays captured image data received from the Web server in the visual communication.

Abstract: A source IP telephone inputs, from its numeric keypad, a telephone number of a call destination and obtains, from an ENUM server, a NAPTR record of the destination IP telephone based upon the input telephone number of the call destination. By referring to a search table, the source IP telephone retrieves, from the obtained NAPTR record, an available specific number in the ascending order of call rates from the lowest based upon communication services available to the source IP telephone. The source IP telephone transmits a call to the destination IP telephone by using the retrieved specific number.

Abstract: Upon receiving, from a source IP terminal, a DNS packet that includes destination NAPTR query data with a keyword, an ENUM server compares the keyword with a keyword of a destination IP terminal stored in a keyword database. When the keywords are identical, the ENUM server generates a reply packet that includes NAPTR records, excluding the keyword, of the destination IP terminal registered in the NAPTR database. When the keywords are not identical, on the other hand, the ENUM server generates a reply packet indicating “No corresponding data.” Then, the ENUM server returns the generated reply packet to the source IP terminal.