JP2009153225A - Ip telephone apparatus and ip telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a burden on a user of an IP telephone apparatus by allowing a calling-side IP telephone apparatus to originate a call while automatically switching call origination according to a fixed telephone number to call origination according to an IP telephone number. <P>SOLUTION: A telephone number mapping (ENUM) server 103 registers in a DB 303 the naming authority pointer (NAPTR) record in which fixed telephone numbers and IP telephone numbers of an IP telephone 101 and an IP telephone 102 are associated with each other. When an ENUM query setting a domain name based on a fixed telephone number is received from the calling-side IP telephone 101, the ENUM server 103 retrieves a NAPTR record corresponding to the domain name from the DB 303 and redirects an ENUM response including the NAPTR record to the IP telephone 101. When the ENUM response is received from the ENUM server 103, the IP telephone 101 extracts the IP telephone number of the called-side IP telephone 102 set to the NAPTR record contained in the ENUM response and starts procedures for call connection with the IP telephone 102. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an IP telephone apparatus and an IP telephone system for making a call over an IP network.

  In recent years, with the rapid spread of the Internet, attention has been paid to an IP telephone system capable of making a low-cost call with a remote telephone apparatus and a free call between IP telephone apparatuses of registered members. It is also known that when a call is made from an PSTN telephone connected to a conventional public line network to an IP telephone apparatus, a telephone number starting from “050” is dialed. Some IP telephone apparatuses can use the conventional PSTN telephone function together and can use both the 0ABJ system telephone number and the IP telephone number.

  Further, for example, in the IP telephone combined type telephone set described in Patent Document 1, the IP telephone on the calling side holds the PSTN telephone number and the IP address. The caller identifies whether the other party is an IP telephone or a PSTN telephone by the presence / absence of an IP address response from the other party telephone, and the IP telephone (or PSTN telephone) on the outgoing side or the incoming side via the IP network or public line network Try to interconnect.

JP 2003-125032 A

  However, when a call is made to an IP telephone apparatus that can use the PSTN telephone function and both the PSAB telephone number and the IP telephone number of the 0ABJ system can be used, the calling user can use the IP telephone number together with the PSTN telephone number. It was also a burden for the user.

  In addition, in the IP telephone combined subscriber telephone described in Patent Document 1, when calling the incoming IP telephone (or PSTN telephone), the other party's IP address is notified to the other party's IP address at the time of incoming or outgoing. The other party is identified as an IP telephone or a PSTN telephone by the presence or absence of an IP address response from the other party telephone, and is interconnected with the other party telephone via the IP network or the public line network. For this reason, the user of the IP telephone needs to store both the PSTN telephone number and the IP telephone number, and the burden on the user is not reduced.

  The present invention has been made in view of such a point, and a call based on a PSTN telephone number is automatically converted to an IP telephone number for an IP telephone apparatus that can use both a PSTN telephone number and an IP telephone number. An object of the present invention is to provide an IP telephone apparatus and an IP telephone system that reduce the burden on the user by switching to the above.

  The present invention is connected via an IP network to an ENUM server that holds a database in which IP telephone number information of the IP telephone apparatus is registered in a NAPTR resource record in association with a domain name based on the PSTN telephone number of the IP telephone apparatus. An IP telephone apparatus, an input means for inputting the PSTN telephone number of the IP telephone apparatus on the called side, a conversion means for converting the input PSTN telephone number to the domain name, and setting the converted domain name Transmitting means for transmitting the received inquiry to the ENUM server, receiving means for receiving one or more NAPTR resource records corresponding to the domain name returned from the ENUM server in response to the inquiry, and receiving by the receiving means SI among the one or more NAPTR resource records A NAPTR resource record that can be used for a protocol is selected, IP phone number information is extracted from this NAPTR resource record, and the IP phone device on the called side is issued via the IP network by the extracted IP phone number information. And a control means for making a call.

  According to the IP telephone apparatus and the IP telephone system according to the present invention, for an IP telephone apparatus that can use both the PSTN telephone number and the IP telephone number, a call based on the PSTN telephone number is automatically called as an IP telephone number. It is possible to reduce the burden on the user by switching automatically.

The figure which shows the structure of the IP telephone system which concerns on Embodiment 1 to which this invention is applied. Block diagram showing the configuration of the IP telephone according to the first embodiment The block diagram which shows the structure of the ENUM server which concerns on this Embodiment 1. The figure which shows an example of the NAPTR record registered into DB of the ENUM server which concerns on this Embodiment 1. The figure which shows an example of the data registered into DB of the DNS server which concerns on this Embodiment 1. Sequence diagram for explaining the operation until the originating IP phone makes a call with the terminating IP phone in the IP telephone system according to the first embodiment FIG. 6 is a diagram showing an example of the content of an “INVITE” message sent from the originating IP phone to the terminating IP phone Flowchart for explaining the operation of the originating IP phone in the sequence of FIG. The figure which shows the structure of the IP telephone system which concerns on Embodiment 2 to which this invention is applied. Block diagram showing the configuration of an IP telephone according to the second embodiment Front view showing the external appearance of the IP phone of FIG. The figure which shows an example of the NAPTR record registered into DB of the ENUM server which concerns on this Embodiment 2. Sequence diagram for explaining the operation until the originating IP phone makes a call with the terminating IP phone in the IP telephone system according to the second embodiment In the IP telephone system according to the second embodiment, a sequence diagram for explaining another operation until the originating IP telephone makes a call with the terminating IP telephone

  The IP telephone apparatus according to the first aspect of the present invention has an ENUM that holds a database in which IP telephone number information of the IP telephone apparatus is registered in a NAPTR resource record in association with a domain name based on the PSTN telephone number of the IP telephone apparatus An IP telephone apparatus connected to a server via an IP network, the input means for inputting the PSTN telephone number of the destination IP telephone apparatus, and the conversion means for converting the input PSTN telephone number to the domain name And a transmission means for transmitting an inquiry in which the converted domain name is set to the ENUM server, and one or more NAPTR resource records corresponding to the domain name returned from the ENUM server in response to the inquiry. Receiving means, and the one or more NAPTs received by the receiving means An NAPTR resource record that can be compatible with the SIP protocol is selected from among the resource records, and an extraction unit that extracts IP telephone number information from the NAPTR resource record; and the called party via the IP network by the extracted IP telephone number information And a control means for making a call to the IP telephone apparatus.

  According to this configuration, the caller IP telephone apparatus can automatically switch the call from the PSTN telephone number to the call from the IP telephone number.

  The IP telephone system according to the second aspect of the present invention relates to the IP telephone apparatus connected to the IP network and the IP telephone number information of the IP telephone apparatus in association with the domain name based on the PSTN telephone number of the IP telephone apparatus. An IP telephone system comprising: an ENUM server that holds a database registered in a NAPTR resource record and returns the NAPTR resource record in response to an inquiry from the IP telephone device, wherein the ENUM server is the IP network Receiving means for receiving a query in which a domain name based on the PSTN telephone number of the destination IP telephone device is received from the IP telephone device on the receiving side via one or more NAPTR corresponding to the domain name in response to the inquiry The resource record is retrieved from the database and the calling party Transmitting means for transmitting to the IP telephone apparatus, wherein the IP telephone apparatus inputs the PSTN telephone number of the IP telephone apparatus on the called side, and converts the input PSTN telephone number into the domain name. A conversion unit; a transmission unit configured to transmit an inquiry in which the converted domain name is set to the ENUM server; and one or more NAPTR resource records corresponding to the domain name returned from the ENUM server in response to the inquiry. And receiving means for selecting a NAPTR resource record compatible with the SIP protocol from the one or more NAPTR resource records received by the receiving means, and extracting IP telephone number information from the NAPTR resource record And the extracted IP phone number information Through P network adopts a configuration and a control means for calling the IP telephone apparatus of the called side.

  According to this configuration, it is possible to automatically switch the call from the PSTN telephone number to the call of the IP telephone number, and the user of the IP telephone apparatus can learn the IP telephone number of the destination IP telephone apparatus. Can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing an overall configuration of the IP telephone system according to the first embodiment. In FIG. 1, an IP telephone system 100 includes a plurality of IP telephone apparatuses (hereinafter referred to as IP telephones) 101 and 102, an ENUM server 103, a DNS server 104, and a call agent (hereinafter referred to as CA) 105 via an IP network 106. Are connected to each other. Note that the IP telephone system may be configured by connecting not less than the configuration of FIG.

  The IP phone 101 (102) has a function that enables voice communication with other IP phones via the IP network 106.

  The ENUM (Telephone Number Mapping) server 103 includes a database (hereinafter referred to as DB) for registering NAPTR (The Naming Authority Pointer) resource records (hereinafter referred to as NAPTR records) which will be described later. The ENUM server 103 returns the NAPTR record registered in the DB to the IP phone 101 (102) in response to the inquiry (ENUM query) of the IP phone 101 (102).

  A DNS (Domain Name System) server 104 includes a DB in which a URI (Uniform Resource Identifier) specified in a NAPTR record and an IP address are registered in association with each other. The DNS server 104 returns the IP address registered in the DB to the IP phone 101 (102) in response to an inquiry from the IP phone 101 (102).

  The CA 105 controls call connection between the IP telephones 101 (102) connected to the IP network 106. The CA 105 executes call connection control with the destination IP phone 101 (102) in response to a call connection request from the IP phone 101 (102) that has received the incoming call.

  FIG. 2 is a block diagram showing a configuration of IP phone 101 according to the first embodiment. IP phone 102 has the same configuration as IP phone 101.

  In FIG. 2, the IP phone 101 is mainly configured by a CPU 201, a memory 202, a handset 203, a display device 204, and a network interface (hereinafter referred to as network I / F) 205.

  A CPU (Central Processing Unit) 201 controls all operations necessary for making a voice call with another IP phone 102 via the IP network 106 based on a voice call control program stored in the memory 202. Therefore, the CPU 201 is compliant with SIP (Session Initiation Protocol) or H.264. In accordance with a call control protocol represented by H.323, call control with the destination terminal is executed. Further, the CPU 201 gives necessary instructions to the display device 204 and the network I / F 205. Further, the CPU 201 sends an ENUM query for inquiring the NUMTR record corresponding to the destination terminal to the ENUM server 103, receives a response to the ENUM query (ENUM response), and makes an IP address inquiry for inquiring the DNS server 104 for an IP address. Transmission and reception control of a response to the IP address inquiry (IP address response) are performed. The CPU 201 functions as a control unit.

  The memory 202 functions as a ROM (Read Only Memory) that stores a voice call control program executed by the CPU 201 and a function as a RAM (Random Access Memory) used as a work memory when the CPU 201 executes the program. Have

  The handset 203 outputs an off-hook signal or an on-hook signal to the CPU 201 in response to an off-hook operation or an on-hook operation by the user. The handset 203 includes a microphone and a speaker. When a call with the destination terminal is started, the user's transmission voice is converted into a transmission voice signal by the microphone and output to the CPU 201. The signal is output as a received voice through a speaker.

  The display device 204 is composed of a liquid crystal panel or the like, and displays the current status of the IP phone 101 and the phone number input from the CPU 201.

  A network I / F 205 is an interface with the IP network 106 to which the IP phone 101 is connected. The network I / F 205 functions as a transmission unit and a reception unit.

  FIG. 3 is a block diagram showing the configuration of the ENUM server 103 according to the first embodiment. In FIG. 3, the ENUM server 103 is mainly configured by a CPU 301, a memory 302, a DB 303, an input / output device 304, and a network I / F 305.

  The CPU 301 controls the entire ENUM server 103 based on a control program stored in the memory 302. For example, when the CPU 301 receives an ENUM query (inquiry) from the IP phone 101, the CPU 301 retrieves a corresponding NAPTR record from data registered in the DB 303 to be described later, and returns it to the IP phone 101 that has sent the ENUM query. The CPU 301 functions as a control unit.

  The memory 302 has a function as a ROM for storing a control program executed by the CPU 301 and a function as a RAM used as a work memory when the CPU 301 executes the program.

  The DB 303 is configured by a hard disk device or the like, and registers the NAPTR record. FIG. 4 is a diagram illustrating an example of a NAPTR record registered in the DB 303 according to the first embodiment. In the figure, a case where a NAPTR record corresponding to a domain name obtained from telephone numbers “0310000000” and “0310000001” is registered is shown.

  The input / output device 304 includes an input device such as a keyboard used when maintaining the ENUM server 103 and an output device such as a display device that displays maintenance information. A network I / F 305 is an interface with the IP network 106 to which the ENUM server 103 is connected. The network I / F 305 functions as a transmission unit and a reception unit.

In the same figure, for the domain name “0.0.0.0.0.0.0.1.3.1.1.8.e164.arpa” obtained from the telephone number “0310000000”, the URI “05011112222 @ tokyo. sip.jp ”and“ //www.tokyo.sip.com/user05011112222.html ”are associated with each other. “E2U + sip” indicating that the SIP service can be supported is described in the former Service field, and http (hypertext transfer) is described in the latter Service field.
protocol) "E2U + http" indicating that the protocol can be supported.

Further, the domain name “1.0.0.0.
0.0.0.1.3.3.1.8. e164. The URIs “05033334444@tokyo.sip.jp” and “//www.tokyo.sip.com/user05033334444.html” are associated with “arpa”. In the former Service field, “E2U + ship” indicating that the SIP protocol can be supported is described, and in the latter Service field, “E2U + http” indicating that the HTTP (hypertext transfer protocol) protocol can be described. ing.

  The telephone numbers “0310000000” and “0310000001” of the IP telephone 101 and the IP telephone 102 are PSTN telephone numbers of the 0ABJ number system, and “05011112222” and “050333334444” included in the URI are the IP telephone number system. IP phone number. Therefore, in the NAPTR record, the PSTN telephone number (0ABJ number) assigned to IP telephone 101 and IP telephone 102 and the IP telephone number are associated with each other.

  FIG. 5 is a diagram showing an example of data registered in the DB of the DNS server 104 according to the first embodiment.

  In the same figure, when URIs “05011112222@tokyo.sip.jp”, “050333334444@tokyo.sip.jp”, “050555556666@tokyo.sip.jp”, and “05077778888@tokyo.sip.jp” are registered. Is shown. Specifically, for the URIs “05011112222@tokyo.sip.jp”, “050333334444@tokyo.sip.jp”, “05055555666@tokyo.sip.jp” and “05077778888@tokyo.sip.jp”, respectively. The IP addresses “192.168.1.1”, “192.168.1.2”, “192.168.1.3”, and “192.168.1.4” are associated with each other.

  The CA 105 also includes a DB that registers all IP telephones connected to the IP network 106, that is, the IP telephone numbers and user information of the IP telephones 101 and 102. When a new IP phone is connected to the IP network 106, the CA 105 acquires the IP phone number and user information of the IP phone and registers them in the DB.

  Next, in the IP telephone system 100 of FIG. 1, the operation until the IP telephone 101 makes a call with the IP telephone 102 will be described with reference to the sequence diagram shown in FIG.

  As a premise for explaining the operation of FIG. 6, it is assumed that the NAPTR record shown in FIG. 4 is registered in the DB 303 of the ENUM server 103 and the data shown in FIG. 5 is registered in the DB of the DNS server 104. The IP phone 101 and the IP phone 102 have a PSAB phone number “0310000000” and “0310000001” in the 0ABJ number system, and an IP phone number “05011112222” starting from “050” in the IP phone number system, respectively. It is assumed that “050333334444” is assigned.

  In the sequence diagram shown in FIG. 6, an operation from when the operator of IP phone 101 inputs the PSTN phone number of IP phone 102 to start a call will be described.

  When the IP phone 101 makes a call with the IP phone 102, first, the IP phone 101 is instructed to send an ENUM query after the operator inputs the PSTN phone number “0310000001” of the IP phone 102.

  After receiving an instruction to send an ENUM query after accepting a PSTN telephone number, the CPU 201 of the IP telephone 101 sends an ENUM query for inquiring about a NAPTR record corresponding to the PSTN telephone number from the network I / F 205 to the ENUM server 103. (Step S601). In this case, the IP phone 101 first sets the PSTN phone number “0310000001” input by the operator to an E.P. It is converted to “+ 81-3-10000001” which is a 164 number, and “+81310000001” is left with the leading “+” and numbers remaining. Then, characters other than the numbers are deleted and dots are inserted between the numbers to obtain “8.1.3.1.0.0.0.0.0.0.1”. Next, the numbers are reversed and the character string “.e164.arpa” is added at the end. Through the above processing, the domain name “1.0.0.0.0.0.0.1.3.1.1.8.e164.arpa” is obtained, and the NAPTR record corresponding to this character string is inquired. An ENUM query is sent to the ENUM server 103.

  When the ENUM server 103 receives the ENUM query from the IP phone 101, the ENUM server 103 receives a NAPTR record corresponding to the domain name “1.0.0.0.0.0.0.1.3.1.1.8e164.arpa”. A search is performed from the DB 303, and an ENUM response including the searched NAPTR record is returned to the IP phone 101 (step S602). In this case, ENUM server 103 searches for a NAPTR record belonging to the lower domain name among the NAPTR records shown in FIG. 4 and returns an ENUM response including this NAPTR record to IP phone 101. By returning this ENUM response to the IP phone 101, the IP phone 101 has the IP phone number “050333334444”, can support the SIP protocol, and can support the https protocol. Will be notified.

  Next, when the IP phone 101 receives an ENUM response including a NAPTR record from the ENUM server 103, the CPU 201 starts from “050333334444@tokyo.sip.jp” specified in the NAPTR record indicating that it can support the SIP protocol. “05033334444” is taken out and the IP telephone number of the IP telephone 102 is recognized. Then, IP phone 101 sends a call including “INVITE” message in which IP phone number “050333334444” is set, from network I / F 205 to CA 105 (step S603).

  Here, an example of setting contents of the “INVITE” message will be described with reference to FIG. The “INVITE” message includes a From header as shown in the third line and a To header as shown in the fourth line. In the From header, contents including the IP phone number “05011112222” of the IP phone 101 that is the transmission source are described. The To header describes the contents including the IP phone number “050333334444” of the IP phone 102 which is the receiving side.

  In particular, in the example shown in the figure, the @ mark is included in the contents described in the From header and To header, and the IP telephone number of the sender or receiver is described on the front side (left side shown in the figure). Yes. The contents described in the From header and the To header are not particularly limited to the contents shown in FIG.

  When CA 105 receives a call including an “INVITE” message from IP phone 101, CA 105 extracts the IP phone number of IP phone 102 on the called side from the To header included in this “INVITE” message. In this case, “05033334444” described in front of the @ mark is extracted as the IP telephone number of the IP telephone 102 on the called side from the description contents of the To header shown in FIG.

Then, CA 105 sends a call including the “INVITE” message received from IP phone 101 to IP phone 102 which is the receiving side (step S604). When IP phone 102 receives a call including an “INVITE” message from CA 105, IP phone 102 sounds a ringing tone to notify the operator of the incoming call and sends a “180 ringing” message to CA 105 (step S605). The CA 105 sends the “180 ringing” message received from the IP phone 102 to the IP phone 101 on the called side (step S606).

  When the IP phone 101 receives the “180 ringing” message from the IP phone 102, a ringback tone is generated from the speaker of the handset 203 to inform the operator that the destination IP phone 102 is being called. Then, when the off-hook of the handset 203 by the operator is detected in the destination IP phone 102, a “200 OK” message indicating connection permission is sent to the IP phone 101 (step S607).

  Next, when receiving the “200 OK” message from IP phone 102, IP phone 101 transmits an “ACK” message to IP phone 102 (step S608). When IP phone 102 receives the “ACK” message from IP phone 101, IP phone 102 enters a state where communication is possible between IP phone 101 and IP phone 102.

  In the sequence diagram of FIG. 6, the portion indicated by a broken line indicates the inquiry processing to the DNS server 104 when the IP telephone 101 specifies the CA 105 by the URI and needs to query the IP address. . In this case, the IP phone 101 sends an inquiry about the IP address corresponding to “050333334444@tokyo.sip.jp” specified in the NAPTR record included in the ENUM response received from the ENUM server 103 to the DNS server 104 (step S611).

  When DNS server 104 receives an IP address inquiry from IP phone 101, DNS server 104 searches for an IP address corresponding to the URI, and returns an IP address response including the IP address to IP phone 101 (step S612). In this case, the DNS server 104 searches for the second IP address (192.168.1.2) from the top of the DB data shown in FIG. 5, and sends an IP address response including the IP address to the IP phone 101. Return to

  When IP phone 101 receives an IP address response from DNS server 104, IP phone 101 recognizes the IP address assigned to IP phone 102 and sends an “INVITE” message to the IP address. The subsequent processing is the same as described above.

  Next, the operation of IP telephone 101 shown in the sequence diagram of FIG. 6 will be described with reference to the flowchart shown in FIG.

  First, in ENUM server 103, it is assumed that a NAPTR record including the correspondence between each PSTN telephone number and IP telephone number of IP telephone 101 and IP telephone 102 shown in FIG. 4 is registered (step S801). When the operator inputs the PSTN telephone number “0310000001” of the IP telephone 102 and is instructed to send an ENUM query (step S802), the IP telephone 101 sends an ENUM query for inquiring a NAPTR record corresponding to the PSTN telephone number to the network. The data is transmitted from the I / F 205 to the ENUM server 103 (step S803).

Next, IP phone 101 waits for reception of an ENUM response sent back from ENUM server 103 in response to the ENUM query (step S804). If an ENUM response is received (step S804: YES), it proceeds to step S805. Then, the presence / absence of registration of the IP number of IP phone 102 is determined based on the NAPTR record of the received ENUM response.

  If the IP phone 101 determines that the IP phone number of the IP phone 102 is registered in the NAPTR record (step S805: YES), the IP phone 101 moves to step S806 and uses the IP phone number extracted from the NAPTR record, A call connection procedure is started with the IP phone 102 via the CA 105.

  IP phone 101 determines that there is no ENUM response in step S804 (step S804: NO) or that IP phone 102 of IP phone 102 is not registered in the NAPTR record received in step S805. In such a case (step S805: NO), the process proceeds to step S807 to execute error processing.

  When CA 105 set in IP phone 101 is in the URI format, processing for DNS server 104 is executed between steps S805 and S806. The processing of the IP phone 101 for the DNS server 104 is not shown in FIG. 7, but the processing content will be described below.

  When the CA 105 set in the IP phone 101 is in the URI format, the IP phone 101 sends an inquiry about the IP address of the CA 105 to the DNS server 104.

  The IP phone 101 waits for the reception of the IP address response of the CA 105 returned from the DNS server 104. When the IP address response is received, the IP phone 101 starts a call connection procedure with the IP phone 102 via the CA 105.

  If the IP phone 101 does not receive an IP address response from the DNS server 104, the IP phone 101 executes the error process in step S807.

  As described above, in IP telephone system 100 according to the first embodiment, NAPTR record in which PSTN telephone numbers (0ABJ numbers) of IP telephone 101 and IP telephone 102 are associated with IP telephone numbers in DB 303 of ENUM server 103. Register. When the ENUM server 103 receives an ENUM query in which a domain name based on the PSTN telephone number is set from the IP phone 101 on the calling side, the ENUM server 103 searches the DB 303 for a NAPTR record corresponding to the domain name, and includes the ENUM including the NAPTR record. A response is sent back to IP phone 101. When IP phone 101 receives the ENUM response from ENUM server 103, IP phone 101 retrieves the IP phone number of destination IP phone 102 set in the NAPTR record included in the ENUM response, and communicates with IP phone 102 via CA 105. To start the call connection procedure.

  Therefore, even if the operator of the originating IP phone 101 does not know the IP phone number of the terminating IP phone 102, the operator automatically executes the ENUM inquiry and ENUM response procedures processed between the IP phone 101 and the ENUM server 103. In addition, it is possible to start a call by the IP telephone number to the destination IP telephone 102. As a result, it is not necessary for the operator of the IP phone 101 to remember both the PSTN phone number and the IP phone number of the called IP phone 102, and only the PSTN phone number needs to be registered in the phone book. Can be reduced.

  In the first embodiment, the case where a call is made from IP phone 101 to IP phone 102 has been described. However, the same sequence and flow can be applied to a case where a call is made from IP phone 102 to IP phone 101. .

(Embodiment 2)
In the second embodiment, in a call connection process between IP telephone devices that can be connected to both the public line network and the IP network, when the call connection with the IP telephone device via the IP network is impossible, the public line network An IP telephone system that enables call connection via the Internet will be described.

  FIG. 9 is a diagram showing an overall configuration of IP telephone system 900 according to the second embodiment. 9, the same components as those in the IP telephone system 100 shown in FIG. 1 are denoted by the same reference numerals, and the description of the same components is omitted.

  9 differs from IP telephone system 100 in FIG. 1 in that IP telephone 901 (902) is connected to public line network 904 via switch 905 (906), and ENUM The function of the server 903 is different.

  FIG. 10 is a block diagram showing a configuration of IP phone 901 according to the second embodiment. In this figure, the same components as those of the IP telephone 101 shown in FIG. 2 are given the same reference numerals, and the description of the same components is omitted. IP phone 902 has the same configuration as IP phone 901.

  The IP phone 901 shown in FIG. 10 is different from the IP phone 101 shown in FIG. 2 in that the function of the CPU 1001 is different and a public line I / F 1002 for connecting the IP phone 901 to the public line network 904 is added. That is.

  The CPU 1001 controls all operations necessary for making a voice call with another IP phone 902 via the IP network 106 based on the voice call control program corresponding to the IP network stored in the memory 202. Therefore, the CPU 1001 is configured to use SIP (Session Initiation Protocol) or H.264. In accordance with a call control protocol represented by H.323, call control with the destination terminal is executed. The CPU 1001 gives necessary instructions to the display device 204, the network I / F 205, and the public line I / F 1002. Further, the CPU 1001 sends an ENUM query for inquiring the NUMTR record corresponding to the destination terminal to the ENUM server 903, receives a response to the ENUM query (ENUM response), and sends an IP address inquiry for inquiring the DNS server 104 for an IP address. Transmission and reception control of a response to the IP address inquiry (IP address response) are performed.

  In addition, the CPU 1001 controls all operations necessary for making a voice call with another IP phone 902 via the public line network 904 based on the public line network compatible voice call control program stored in the memory 202. To do.

  The public line I / F 1002 has a modem function as an interface with the public line network 904 to which the IP telephone 901 is connected, a function for executing a call connection / disconnection procedure with the exchange 905, and a receiving side after the call connection. A function for setting a call function with an exchange 906 to which the IP telephone 902 is connected.

  When the exchange 905 receives the PSTN telephone number of the destination IP telephone 902 from the IP telephone 901, the exchange 905 executes call connection processing with the exchange 906 to which the destination terminal is connected via the public line network 904 and calls connection. The subsequent call state is monitored and call disconnection processing is executed.

  FIG. 11 is a front view showing the appearance of IP phone 901. IP phone 902 has a similar configuration.

In FIG. 11, an IP phone 901 includes a handset 203 having a microphone for receiving operator's voice, a speaker for outputting received voice, a numeric keypad 1102 for receiving a telephone number, an answering key 1103 for switching an answering machine function, A speaker key 1104 for switching sound to external output and a function key 1105 capable of setting various functions typified by a one-touch transmission function are provided. Further, a LAN interface (LAN I / F) 1106 connected to the IP network 106 and a public line interface (public line I / F) 1107 connected to the public line network 904 are provided on the side surface.

  A display device 204 composed of a liquid crystal panel or the like is provided above the function key 1105. The display device 204 displays a caller number received from the ENUM server 903 or a name registered in the telephone book in association with the caller number.

  FIG. 12 is a diagram illustrating an example of a NAPTR record registered in the DB 303 of the ENUM server 903. In the figure, a case where a NAPTR record corresponding to the domain name obtained from the IP telephone numbers “05011112222” and “050333334444” is shown.

  In the figure, the URI scheme “sip: for the domain name“ 2.2.2.2.1.1.1.1.0.5.0.e164.arpa ”obtained from the IP telephone number“ 05011112222 ”. 05011112222@tokyo.sip.jp "is associated. In the Service field, “E2U + sip” is described which indicates that the IP phone can be supported.

  Furthermore, the URI scheme “tel: 81310000000; svc = voice” is associated with the domain name “2.2.2.2.1.1.1.1.0.5.0.e164.arpa”. Yes. In the Service field, “E2U + voice: tel” indicating that the PSTN telephone can be supported is described. Also, Order = 100 is described in the Service field “E2U + ship”, and Order = 200 is described in the Service field “E2U + voice: tel”. The Order value indicates the priority of Service.

  In the figure, the URI scheme “sip: for the domain name“ 4.4.4.4.3.3.3.3.3.0.e164.arpa ”obtained from the IP telephone number“ 050333334444 ”. 050333334444@tokyo.mail.com ”is associated. In the Service field, “E2U + sip” is described which indicates that the IP phone can be supported.

  Furthermore, the URI scheme “tel: 81310000001; svc = voice” is associated with the domain name “4.4.4.4.4.3.3.3.3.0.5.0.e164.arpa”. Yes. In the Service field, “E2U + voice: tel” indicating that the PSTN telephone can be supported is described. Also, Order = 100 is described in the Service field “E2U + ship”, and Order = 200 is described in the Service field “E2U + voice: tel”. The Order value indicates the priority of Service.

  The telephone numbers “05011112222” and “050333334444” of the IP phone 901 and the IP phone 902 are the phone numbers of the IP phone number system, and the PSTN phone numbers “0310000000” and “0310000001” included in the URI are 0ABJ. This is a telephone number of the number system. Therefore, in the NAPTR record, the IP telephone number assigned to the IP telephone 901 and the IP telephone 902 and the PSTN telephone number (0ABJ number) are associated with each other.

  When the ENUM server 903 receives an ENUM query in which a domain name based on the IP phone number of the called IP phone 902 is set from the IP phone 901, the ENUM server 903 searches the NAPTR record shown in FIG. An ENUM response including “” is returned to the IP phone 901.

  Next, in the IP telephone system 900 of FIG. 9, the operation until the IP telephone 901 makes a call with the IP telephone 902 will be described with reference to the sequence diagram shown in FIG.

  As a premise for explaining the operation in FIG. 13, it is assumed that the NAPTR record shown in FIG. 12 is registered in the DB 303 of the ENUM server 903. The IP phone 901 and the IP phone 902 have PSTN phone numbers “0310000000” and “0310000001” in the 0ABJ number system, and IP phone numbers “05011112222” and “0”, which start from “050” in the IP phone number system, respectively. It is assumed that “050333334444” is assigned.

  In the sequence diagram shown in FIG. 13, an operation from when the operator of IP phone 901 inputs the IP phone number of IP phone 902 to start a call will be described.

  When the IP phone 901 makes a call with the IP phone 1902, first, after the IP phone number “050333344444” of the IP phone 902 is input by the operator, the IP phone 901 sets “INVITE” with the IP phone number “050333334444” set. The call including the message is sent from the network I / F 205 to the CA 105 (step S1301).

  Here, an example of setting contents of the “INVITE” message will be described with reference to FIG. The “INVITE” message includes a From header as shown in the third line and a To header as shown in the fourth line. In the From header, contents including the IP phone number “05011112222” of the IP phone 901 that is the transmission source are described. In addition, the To header describes the contents including the IP telephone number “050333334444” of the IP telephone 902 which is the receiving side.

  In particular, in the example shown in the figure, the @ mark is included in the contents described in the From header and To header, and the IP telephone number of the sender or receiver is described on the front side (left side shown in the figure). Yes. The contents described in the From header and the To header are not particularly limited to the contents shown in FIG.

  When CA 105 receives a call including an “INVITE” message from IP phone 901, CA 105 extracts the IP phone number of IP phone 902 on the called side from the To header included in this “INVITE” message. In this case, “05033334444” described in front of the @ mark is extracted as the IP telephone number of the destination IP telephone 902 from the description contents of the To header shown in FIG.

  Then, CA 105 transmits the call including the “INVITE” message received from IP phone 901 to IP phone 902 which is the receiving side (step S1302). In the present embodiment, the response to the “INVITE” message is not returned to the IP phone 901 due to the occurrence of a failure in the IP network 106 or the failure of the network I / F 205 of the IP phone 902. This is shown in FIG.

Then, CA 105 starts a timer for waiting for a response from IP phone 902, and when a time-out error occurs, returns “408 time-out” message to IP phone 901 (step S1303). In some cases, the CA 105 does not perform time-out management. In this case, the response signal for INVITE does not reach the IP phone 901.

  When the IP phone 901 receives the “408 timeout” message from the CA 105 or determines that the INVITE response signal is not returned, the IP phone 901 sends an ENUM query for inquiring about the NAPTR record corresponding to the IP phone number “050333334444” of the IP phone 902 from the network I / F 205. This is sent to the ENUM server 903 (step S1304). In this case, the IP phone 901 performs the same processing described in the first embodiment, and the domain name “4.4.4.4.3.3.3.3.0.5.” For the IP phone number “050333334444”. 0e164.arpa "is sent to the ENUM server 903 to inquire about the NAPTR record corresponding to this character string.

  When the ENUM server 903 receives the ENUM query from the IP phone 901, the ENUM server 903 sends a NAPTR record corresponding to the domain name “4.4.4.4.3.3.3.3.5.0.e164.arpa”. A search is performed from the DB 303, and an ENUM response including the searched NAPTR record is returned to the IP phone 901 (step S1305).

  Next, when the IP phone 901 receives an ENUM response including a NAPTR record from the ENUM server 903, the IP phone 901 selects and designates a NAPTR record indicating that it can support a PSTN phone with a high order value (low priority). In addition, the country code 81 is removed from “tel: 81310000001; svc = voice”, 0 is added to extract “0310000001”, and the PSTN telephone number of the IP phone 902 is recognized. The IP telephone 901 uses the PSTN telephone number “0310000001” to make a call from the public line I / F 1002 to the exchange 905 (step S1306).

  Upon receiving the PSTN telephone number “0310000001” of IP phone 902 from IP phone 901, switch 905 sends a call connection request to switch 906 to which IP phone 902 is connected via public line network 904 (step S1307). When receiving the call connection request from the switch 905, the switch 906 sends an incoming call signal to the IP phone 902 (step S1308). When the IP telephone 902 receives the incoming call signal from the exchange 906, the IP telephone 902 rings the ring tone to notify the operator and sends a ringback tone to the exchange 906 (step S1309). The exchange 906 sends the ringback tone signal received from the IP phone 902 to the exchange 905 (step S1310).

  The exchange 905 sends the ringback tone signal received from the exchange 906 to the IP phone 901 (step S1311). IP phone 901 causes the operator to hear the ring tone of IP phone 902 from the speaker of handset 203 by the ringback tone signal received from switch 905.

  Then, when the handset 203 is operated off-hook, the IP phone 902 sends an off-hook signal to the exchange 906 (step S1312). When receiving the off-hook signal from IP phone 902, switch 906 completes the call connection with IP phone 901 connected to switch 905 (step S1313). When the call connection is completed, a call can be made between the IP phone 901 and the IP phone 902 via the public line network 904.

As described above, in the IP telephone system 900 according to the second embodiment, the NAPTR record in which the PSTN telephone number (0ABJ number) of the IP telephone 901 and the IP telephone 902 is associated with the IP telephone number in the DB 303 of the ENUM server 903. Register. Then, in the call connection processing between the IP phone 901 and the IP phone 902 that can be connected to both the public line network and the IP network, if the call connection with the IP phone 902 via the IP network 106 is impossible, the outgoing call The original IP phone 901 sends to the ENUM server 903 an ENUM query in which the domain name obtained from the IP phone number of the destination IP phone 902 is set. ENUM server 903 searches for a NAPTR record corresponding to the domain name set in the ENUM query received from IP phone 901, and returns an ENUM response including the NAPTR record to IP phone 901. The IP phone 901 extracts the PSTN phone number of the called IP phone 902 from the NAPTR record included in the ENUM response received from the ENUM server 903, and makes a call to the IP phone 902 via the public line network 904 using the PSTN phone number. I called it.

  Therefore, in a call connection process between IP telephones that can be connected to both the public line network and the IP network, if call connection via the IP network 106 is impossible, the call is automatically switched to the public line network. Therefore, the operator of the IP phone can reduce the trouble of making a call again. When switching from a free IP telephone call to a pay-per-use billing public network: PSTN telephone, it may have a function of notifying the operator with a sound, a lamp, or the like.

  Next, in the case of an incoming IP phone, information on the originator's IP phone caller (PSTN phone number or the name of the caller registered in the telephone directory inside the phone) is displayed on the display device 204. The connection procedure will be described below.

  Next, in the IP telephone system 900 of FIG. 9, the operation until the IP telephone 901 makes an IP call with the IP telephone 902 will be described with reference to the sequence diagram shown in FIG.

  As a premise for explaining the operation of FIG. 14, it is assumed that the NAPTR record shown in FIG. 12 is registered in the DB 303 of the ENUM server 903. The IP phone 901 and the IP phone 902 have PSTN phone numbers “0310000000” and “0310000001” in the 0ABJ number system, and IP phone numbers “05011112222” and “0”, which start from “050” in the IP phone number system, respectively. It is assumed that “050333334444” is assigned.

  The sequence diagram shown in FIG. 14 describes the operation from when the operator of IP phone 901 enters the IP phone number of IP phone 902 to start a call.

  When the IP phone 901 makes a call with the IP phone 902, first, the IP phone 901 is inputted with the IP phone number “050333334444” of the IP phone 902 by the operator.

  The IP phone 901 sends a call including the “INVITE” message from the network I / F 205 to the CA 105 using the input IP phone number (step S1403).

  Here, an example of setting contents of the “INVITE” message will be described with reference to FIG. The “INVITE” message includes a From header as shown in the third line and a To header as shown in the fourth line. In the From header, contents including the IP phone number “05011112222” of the IP phone 901 that is the transmission source are described. The To header describes the contents including the IP phone number “050333334444” of the IP phone 902 that is the called party.

In particular, in the example shown in the figure, the @ mark is included in the contents described in the From header and To header, and the IP telephone number of the sender or receiver is described on the front side (left side shown in the figure). Yes. The contents described in the From header and the To header are not particularly limited to the contents shown in FIG.

  When CA 105 receives a call including an “INVITE” message from IP phone 901, CA 105 extracts the IP phone number of IP phone 902 on the called side from the To header included in this “INVITE” message. In this case, “05033334444” described in front of the @ mark is extracted as the IP telephone number of the destination IP telephone 902 from the description contents of the To header shown in FIG.

  Then, CA 105 sends a call including the “INVITE” message received from IP phone 901 to IP phone 902 on the receiving side (step S1404). When IP phone 902 receives a call including an “INVITE” message from CA 105, IP phone 902 rings a ringing tone to notify the operator of the incoming call and sends a “180 ringing” message to CA 105 (step S1405). The CA 105 sends the “180 ringing” message received from the IP phone 902 to the IP phone 901 on the called side (step S1406).

  When IP phone 901 receives the “180 ringing” message from IP phone 902, a ringback tone is generated from the speaker of handset 203 to inform the operator that the destination IP phone 902 is being called.

  Next, IP phone 902 extracts the IP phone number “05011112222” of IP phone 901 that is the transmission source described in the From header of the “INVITE” message received earlier, and performs the same processing described in the first embodiment. , Obtain the domain name “2.2.2.2.1.1.1.1.0.5.0.e164.arpa” for the IP phone number “05011112222” and store the NAPTR record corresponding to this character string. The ENUM query to be inquired is sent to the ENUM server 903 (step S1407).

  When the ENUM server 903 receives the ENUM query from the IP phone 902, the ENUM server 903 receives a NAPTR record corresponding to the domain name “2.2.2.2.1.1.1.1.0.5.0.e164.arpa”. A search is performed from the DB 303, and an ENUM response including the searched NAPTR record is returned to the IP phone 902 (step S1408). In this case, ENUM server 903 searches for a NAPTR record belonging to the upper domain name among the NAPTR records shown in FIG. 12, and returns an ENUM response including this NAPTR record to IP phone 902. By returning this ENUM response to IP phone 902, IP phone 902 is notified that the PSTN phone number of IP phone 901 is “0310000000”.

  Next, when receiving an ENUM response including a NAPTR record from the ENUM server 903, the IP phone 902 takes out the PSTN phone number “0310000000” of the IP phone 901 and displays it on the display device 204. This display example is shown on the display device 204 in FIG. With this display, the operator of the IP phone 902 can recognize who the caller is and can determine whether or not to respond to the current call. If the PSTN telephone number is registered in the telephone directory, the name of the caller registered in the telephone directory may be displayed on the display device 204.

  Then, when the off-hook of the handset 203 by the operator is detected in the destination IP phone 902, a “200 OK” message indicating permission of connection is sent to the IP phone 901 (step S1409).

Next, upon receiving the “200 OK” message from IP phone 902, IP phone 901 sends an “ACK” message to IP phone 902 (step S1410).
When IP phone 902 receives an “ACK” message from IP phone 901, IP phone 902 becomes in a state where communication is possible between IP phone 901 and IP phone 902.

  As described above, even when the IP phone 901 makes a call with an IP phone number, the destination IP phone 902 acquires the PSTN phone number of the caller from the ENUM server 903, and the acquired PSTN phone number is received at the time of the incoming call. Display on the phone. Therefore, the operator of the destination IP phone 902 need not remember the IP phone number of the source IP phone 901, and if only the PSTN phone number is registered in the phone book, the name registered in the phone book of the phone is registered. You can know who the caller is.

  Therefore, the operator of the destination IP phone 902 can determine who is the caller from the displayed PSTN phone number or name and decide whether to go off-hook or not. You can avoid receiving it.

  Further, since the PSTN telephone number assigned to the IP phone 901 on the calling side or the registered name is displayed on the telephone directory on the display device 204, the operator of the IP telephone 902 is more than when the IP telephone number is displayed. Even it is easy to see who the caller is. Only the PSTN telephone number needs to be registered in the telephone directory, and the burden on the operator can be reduced.

  In the second embodiment, the case where a call is made from IP phone 901 to IP phone 902 has been described. However, the same sequence and flow can be applied to a case where a call is made from IP phone 902 to IP phone 901. .

  According to the IP telephone apparatus and the IP telephone system according to the present invention, it is possible to automatically switch a call from a PSTN telephone number to a call from an IP telephone number, thereby reducing the burden on the user of the IP telephone apparatus. This is useful in that an IP telephone system can be provided.

100, 900 IP telephone system 101, 102, 901, 902 IP telephone 103, 903 ENUM server 104 DNS server 105 CA
106 IP network 201 CPU
202 Memory 203 Handset 204 Display Device 205 Network I / F
904 Public line network 905, 906 Exchange 1002 Public line I / F

Claims (2)

An IP telephone apparatus connected via an IP network to an ENUM server that holds a database in which IP telephone number information of the IP telephone apparatus is registered in a NAPTR resource record in association with a domain name based on the PSTN telephone number of the IP telephone apparatus There,
An input means for inputting the PSTN telephone number of the IP telephone device on the called side;
Conversion means for converting the inputted PSTN telephone number into the domain name;
Transmitting means for transmitting an inquiry in which the converted domain name is set to the ENUM server;
Receiving means for receiving one or more NAPTR resource records corresponding to the domain name returned from the ENUM server in response to the inquiry;
Extracting means for selecting a NAPTR resource record compatible with the SIP protocol from the one or more NAPTR resource records received by the receiving means, and extracting IP telephone number information from the NAPTR resource record;
An IP telephone apparatus comprising: control means for causing the called IP telephone apparatus to make a call via the IP network based on the extracted IP telephone number information. An IP telephone device connected to the IP network, and a database in which IP telephone number information of the IP telephone device is registered in a NAPTR resource record in association with a domain name based on the PSTN telephone number of the IP telephone device; An IP phone system comprising: an ENUM server that returns the NAPTR resource record in response to an inquiry from a device;
The ENUM server is
Receiving means for receiving an inquiry in which a domain name based on the PSTN telephone number of the called IP telephone apparatus is set from the calling IP telephone apparatus via the IP network;
Transmission means for retrieving one or more NAPTR resource records corresponding to the domain name in response to the inquiry from the database and transmitting them to the originating IP telephone device;
The IP telephone device
An input means for inputting the PSTN telephone number of the IP telephone device on the called side;
Conversion means for converting the inputted PSTN telephone number into the domain name;
Transmitting means for transmitting an inquiry in which the converted domain name is set to the ENUM server;
Receiving means for receiving one or more NAPTR resource records corresponding to the domain name returned from the ENUM server in response to the inquiry;
Extracting means for selecting a NAPTR resource record that is compatible with the SIP protocol from the one or more NAPTR resource records received by the receiving means, and extracting IP telephone number information from the NAPTR resource record;
An IP telephone system comprising: control means for causing the called IP telephone apparatus to make a call via the IP network based on the extracted IP telephone number information.

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