JP4179506B2 - Communication terminal - Google Patents

Description

  The present invention relates to a communication terminal that performs communication using VoIP (Vice over IP). In particular, for example, an identification number and address information on a communication network are assigned, and the correspondence between the identification number and the address information is described. The present invention relates to a communication terminal that establishes a connection with a desired communication terminal using a server that manages a correspondence table.

  In a system using a conventional IP telephone as a communication terminal that performs communication using VoIP, as shown in FIG. 7, an IP (Internet Protocol) is provided between telephones B, C, and D that can communicate with each other. A registration server (server) 40 and a proxy server 50 provided on the network are interposed.

  The database 40a provided in the registration server 40 holds a correspondence table 40b in which telephone numbers (identification numbers; numbers starting with 050) assigned to the respective telephones are associated with IP addresses (address information) of the respective telephones. . For example, when calling from the telephone C to the telephone D, the user of the telephone C inputs the telephone number of the telephone D to the telephone C. Then, the telephone C is first connected to the proxy server 50, and the telephone number of the telephone D input to the telephone C is transmitted to the proxy server 50. The proxy server 50 requests the IP address of the telephone D by transferring the telephone number of the telephone D transmitted from the telephone C to the registration server 40. The registration server 40 searches the correspondence table 40b based on the telephone number of the telephone D transferred from the proxy server 50, and identifies the IP address corresponding to the telephone number of the telephone D. Then, the IP address of the specified telephone D is returned to the proxy server 50. Proxy server 50 transmits a call from telephone C to telephone D based on the IP address returned from registration server 40. The “call” means a call to a communication terminal such as the telephone D.

  In such an IP telephone system, for example, a call for the telephone D, which is made from the telephone C, can be transferred to the telephone B. Such a call transfer is performed by referring to the correspondence from the telephone number of the telephone D to the IP address of the telephone D in the correspondence table 40b held in the registration server 40, and from the telephone number of the telephone D to the IP address of the telephone B. It is realized by changing to correspondence.

  First, the user of the telephone D registers the user ID and password in the registration server 40 in advance (<1> in FIG. 7). To transfer a call to the telephone D to the telephone B, the user of the telephone D sets the telephone D to the transfer setting mode by a predetermined operation, and sets the user ID, password, and telephone number of the telephone B as the call transfer destination. Enter (<2>). Then, along with the transfer setting request, the user IP, password, and telephone number of the telephone set B are transmitted to the registration server 40 (<3>).

  The registration server 40 determines whether or not the user ID and password transmitted together with the transfer request match the user ID and password registered in the registration server 40 in advance, and accepts the transfer request if they match. When the transfer request is accepted, the registration server 40 specifies the IP address of the telephone B from the telephone number of the telephone B transmitted together with the transfer request, updates the correspondence table 40b, and sets the IP address of the telephone B as the telephone D. Correspond to the phone number.

  In this state, when a call is made from the telephone C to the telephone D (<4>), the proxy server 50 transfers the telephone number of the telephone D to the registration server 40 and inquires about the location of the telephone D (<5>). . Upon receiving the inquiry about the location of the telephone D, the registration server 40 refers to the correspondence table 40b and returns the IP address of the telephone B as the location of the telephone D to the proxy server 50 (<6>). The proxy server 50 transfers the call from the telephone C to the telephone B based on the IP address returned from the registration server 40 (<7>). In this way, a call from the telephone C to the telephone D is transferred to the telephone B.

  Note that the call transfer operation for the telephone D can be performed from a telephone B other than the telephone D as shown in FIG. In this case as well, it is necessary to input three pieces of information including a user ID, a password, and a transfer destination telephone number for call transfer setting.

  As described above, the prior art has a problem that it takes time and effort to input three pieces of information, that is, a user ID, a password, and a transfer destination telephone number each time call transfer is set.

  SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a communication terminal capable of performing call transfer setting without taking time and effort.

  According to the first aspect of the present invention, connection to a desired communication terminal is performed using a server that manages an association table in which an identification number and address information on a communication network are assigned and a correspondence relationship between the identification number and the address information is described. In the communication terminal that establishes the connection, when the connection request is received with the standby mode set, the establishing means for establishing a connection with the requesting communication terminal, and after the connection is established by the establishing means, Transmitting means for transmitting to the server a request signal for requesting to change the correspondence destination of its own identification number from its own address information to the address information of the requesting communication terminal when receiving a specific signal from the communication terminal It is a communication terminal characterized by comprising.

  In the first aspect of the invention, when the establishing means receives a connection request in a state where the standby mode is set, the establishing means establishes a connection with the connection source communication terminal. When the transmission means receives a specific signal from the requesting communication terminal after the connection is established by the establishing means, the correspondence destination of the identification number in the correspondence table is determined from the address information of the requesting communication terminal. A request signal requesting to change to address information is transmitted to the server. Therefore, only by transmitting the specific signal, the address information corresponding to the identification number of the communication terminal can be changed, and the communication terminal to be connected can be changed in response to the connection request.

  The invention according to claim 2 further includes first holding means for holding the first secret code, the specific signal includes the second secret code, and the transmitting means specifies the first secret code held by the first holding means. The communication terminal according to claim 1, wherein a request signal is transmitted to the server when a predetermined relationship is satisfied with the second secret code included in the signal.

  According to a second aspect of the present invention, the communication terminal further comprises first holding means for holding the first secret code. The specific signal includes the second secret code, and the transmitting means has a predetermined relationship between the first secret code held by the first holding means and the second secret code included in the specific signal, for example, the first secret code. A request signal is transmitted to the server when a relationship such that the one secret code matches the second secret code or the first secret code matches the decrypted second secret code is satisfied. Therefore, only when the first secret code and the second secret code have a predetermined relationship, the communication terminal to be connected can be changed in response to the connection request.

  The invention according to claim 3 further comprises second holding means for holding an access code for accessing the server, and the request signal includes an access code held by the second holding means. It is a terminal.

  According to a third aspect of the present invention, the communication terminal further includes second holding means for holding an access code for accessing the server. The request signal includes the access code held by the second holding means. Therefore, the user does not have to input the access code when changing the communication terminal to be connected in response to the connection request.

  The invention of claim 4 is the communication terminal according to any one of claims 1 to 3, wherein the identification number is a telephone number, the communication network is an IP network, and the address information is an IP address.

  In the invention of claim 4, a telephone number, an IP network and an IP address are adopted as the identification number, the communication network and the address information, respectively. Therefore, an existing system can be used.

  The invention according to claim 5 is the communication terminal according to any one of claims 1 to 4, wherein the standby mode is an answering machine mode.

The invention of claim 6 is the communication terminal according to claim 3 , wherein the access code includes a user ID and a password.

The invention of claim 7, further comprising a third holding means for holding its own address information, the connection request, the third holding means of the requesting communication terminal including the address information to be held, according to claim 1 to 6 Any one of the communication terminals.

  In the invention of claim 7, the communication terminal includes third holding means for holding its own address information. The connection request includes address information of the requesting communication terminal. Since the request source address information is acquired from the third holding means and included in the connection request, the user of the request source communication terminal does not have to input it. Therefore, the user of the requesting communication terminal can change the communication terminal to be connected in response to the connection request simply by inputting the personal identification number as the specific signal to the communication terminal.

  According to the present invention, since call forwarding is set only by inputting a personal identification number, it is possible to save the user's trouble.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  FIG. 1 shows an embodiment of an IP (Internet Protocol) telephone A (hereinafter simply referred to as “telephone A”) to which the present invention is applied. Note that the telephone set B and the telephone set C shown in FIG. 1 may be either conventional IP telephones to which the present invention is not applied or IP telephones to which the present invention is applied. The telephones B and C are not limited to IP telephones but may be general subscriber telephones. In this embodiment, however, the telephones A, B and C are all assumed to be IP telephones to which the present invention is applied. To do. Telephone A, telephone B and telephone C are connected to the IP network.

  The telephone A is specifically configured as shown in FIG. As can be seen from FIG. 2, the telephone A includes a CPU 12. Connected to the CPU 12 are a DSP 14, a display 16, a keypad 18, an EEPROM (Electronically Erasable PROM; first, second and third holding means) 20, a RAM 22 and a network controller 24. The DSP 14 is connected to the speaker 30 provided in the receiver 36 via the D / A converter 28, and is connected to the microphone 34 also provided in the receiver 36 via the A / D converter 32. . The network controller 24 is connected to a communication connector 26, and the communication connector 26 is connected to the IP network by a predetermined cable. Therefore, the CPU 12 can transmit and receive data to the IP network via the network controller 24 and the communication connector 26.

  A registration server (server) 40 and a proxy server 50 exist on the IP network. The operations and roles of the registration server 40 and the proxy server 50 are as described in “Background Art”. In the conventional technique, it is necessary to input three pieces of information such as a user ID, a password, and a telephone number of a transfer destination telephone each time call transfer is set. However, when setting the transfer of a call sent to the telephone set A to which the present invention shown in FIG. 1 is applied, it is only necessary to input a personal identification number to the transfer destination telephone set B.

  Transfer setting for transferring a call to the telephone A to the telephone B, that is, rewriting of the correspondence table 40b between the telephone number and the IP address held by the registration server 40 is executed according to the procedure shown in FIG. First, the user of the telephone A registers the user ID and password in the registration server 40 and the telephone A in advance (<1>). At this time, a predetermined personal identification number (first secret code) is also registered in the telephone set A.

  The user ID and password are recorded in the registration server 40 because the user ID and password (access code) transmitted to the registration server 40 together with a transfer setting request (request signal) are stored in the registration server 40 in advance. This is because a transfer setting request is accepted only when the registered user ID and password match. The access code is not limited to the user ID and password, but may be a combination such as a telephone number or IP address and a secret word, or a form of only a secret word is also conceivable.

  In this embodiment, a call made from the telephone C to the telephone A is transferred to the telephone B. In this case, the user calls the telephone set A from the telephone set B, which is the transfer destination, and performs a transfer setting operation from the telephone set B to the telephone set A. At this time, the user inputs a personal identification number (second secret code as a specific signal) to the telephone set B. Then, the personal identification number input to the telephone set B is transmitted to the telephone set A. The telephone A compares the personal identification number (second secret code) transmitted from the telephone B with the personal identification number (first secret code) registered in advance in the telephone A, and from the telephone B only when they match. Accept the transfer setting operation. Then, when the telephone set A accepts the transfer setting operation by the telephone set B, the telephone set A transmits the user ID, password, and position information of the telephone set B registered in advance to the registration server 40 to the telephone set A. The registration server 40 is requested to set transfer of the call to the telephone set B. The specific signal may be a signal notifying the start of the transfer setting operation instead of the password.

  In order to perform the transfer setting operation from the telephone B to the telephone A, the telephone B needs to call the telephone A. At this time, it is assumed that the telephone A is in the answering machine mode (standby mode). In this embodiment, SIP (Session Initiation Protocol) is adopted as a signaling technique for controlling outgoing / incoming calls of IP telephones. In SIP, a message for controlling outgoing / incoming calls is created in a text format.

  FIG. 3 shows messages transmitted and received between the telephone B and the telephone A when the user calls the telephone A from the telephone B. When the user inputs the telephone number of the telephone A to the telephone B, the telephone B sends an “INVITE” message requesting to establish a session between the telephone B and the telephone A to the telephone A ({ 1}). This corresponds to transmission from the telephone set B to the telephone set A shown in <2> of FIG. This “INVITE” message consists of the text shown in FIG. As shown in FIG. 4, the “INVITE” message includes source information SI indicating the source of the “INVITE” message and reply destination information RI designating the reply destination of the message. Both the sender information SI and the reply destination information RI are generated based on own device information OI (address information) which is the IP address of the own device recorded in the EEPROM 20 of the telephone set B. The address information is not limited to the IP address, but may be a telephone number.

  When the “INVITE” message is received, the telephone A transmits a “100 Trying” message indicating that the “INVITE” message has been received to the telephone B as a provisional response to the “INVITE” message ({2}). This “100 Trying” message is transmitted to the telephone set B indicated by the reply destination information RI included in the “INVITE” message. Subsequently, the telephone A transmits a “180 Ringing” message indicating that the user of the telephone A is being called as a provisional response ({3}). At this time, the telephone A generates a ringing tone. The telephone A is set to the answering machine mode. For example, the answering machine function responds to a call from the telephone B with 10 ringing sounds (<3> in FIG. 1). Note that the standby mode is not limited to the answering machine mode. If the user does not respond even if the user calls the user for a predetermined number of times using a ringing tone, the transfer mode automatically shifts to a state in which a transfer setting operation is accepted. It may be a dedicated mode for. When the answering machine function of the telephone A responds, the telephone A transmits a “200 OK” message to the telephone B indicating that the request by the “INVITE” message is successful ({4}).

  When the “200 OK” message is received, the telephone set B transmits an “ACK” message indicating that the “200 OK” message has been received to the telephone set A ({5}). When the telephone set A receives the “ACK” message, a communication protocol RTP (Real-time Transport Protocol) is established between the telephone set A and the telephone set B ({6}).

  When RTP is established between phone A and phone B, the answering machine function of phone A is “going out right now. The user of the telephone set B inputs “#” to the telephone set B before the announcement is finished. Then, since the answering machine function sends an announcement such as “Please enter the PIN”, the user of the telephone B enters the PIN into the telephone B (<4> in FIG. 1). The personal identification number input to the telephone B is transmitted to the telephone A (<4> 'in FIG. 1). In the telephone A, it is confirmed whether or not the personal identification number received from the telephone B matches the personal identification number recorded in the EEPROM 20 of the telephone A in advance. If the two match, an announcement “Transfer setting accepted” is sent.

  The user of the telephone set B confirms the announcement “transfer setting accepted” and places the telephone set 36 of the telephone set B. Then, the telephone B transmits a “BYE” message requesting the end of the session to the telephone A ({7}). Upon receiving the “BYE” message, the telephone set A transmits a “200 OK” message indicating that the session end request using the “BYE” message is successful to the telephone set B ({8}). Thus, the communication between the telephone A and the telephone B is completed, and the operation for setting the transfer to the telephone A is completed.

  When the transfer setting operation is performed, the telephone set A transmits the user ID and password registered in advance in <1> of FIG. 1 and the transfer destination (the IP address of the telephone set B) to the registration server 40 (<5> ). The origin of this forwarding destination (IP address of telephone B) will be described later. At this time, as shown in FIG. 5, the telephone set A transmits a transfer setting message called “REGISTER” to the registration server 40 ({1}). Then, the registration server 40 that has received the “REGISTER” message returns a “200 OK” message to the telephone A indicating that the transfer setting request using the “REGISTER” message has been completed ({2}).

  Specifically, the “REGISTER” message is made up of the text shown in FIG. As shown in FIG. 6, the “REGISTER” message includes transfer source information FI, transfer destination information TI, and authentication information AI. The transfer source information FI indicates the IP address of the telephone A that is the transfer source of the transfer telephone. The transfer source information FI is created based on the own device information OI recorded in the EEPROM 20 of the telephone set A. The own device information OI is the IP address of the telephone A itself. The transfer destination information TI indicates the IP address of the telephone set B that is the transfer destination of the transfer telephone. The transfer destination information TI is created based on the reply destination information RI (see FIG. 4) included in the “INVITE” message received by the telephone set A from the telephone set B. This transfer destination information TI is a transfer destination transmitted to the registration server 40 in <5> of FIG.

  The authentication information AI is information for authenticating the transfer setting request by the “REGISTER” message. The authentication information AI includes the user ID ui and the password PS registered in the telephone set A in <1> of FIG. However, the password PS is encrypted by a predetermined encryption method.

  Upon receiving the “REGISTER” message, the registration server 40 obtains the user ID ui and the password PS from the “REGISTER” message, decrypts the password PS, and stores the user ID and password of the telephone set A registered in the registration server 40 in advance. Compare. When the user ID ui and password PS acquired from the “REGISTER” message match the user ID and password registered in the registration server 40, a transfer setting request by the “REGISTER” message is accepted.

  Upon receiving the transfer setting request, the registration server 40 rewrites the IP address corresponding to the telephone A recorded in the correspondence table 40b with the IP address of the telephone B indicated by the transfer destination information TI included in the “REGISTER” message.

  When a call is made from the telephone C to the telephone A (<6> in FIG. 1) in such a state where the transfer setting is performed, the inquiry about the location of the telephone A (<7>) from the proxy server 50 is made. The IP address of the telephone set B is returned from the registration server 40 (<8>). Then, the proxy server 50 transfers the call from the telephone C to the telephone B based on the IP address returned from the registration server 40 (<9>). As described above, in the telephone set A to which the present invention is applied, the call transfer setting for the telephone set A can be performed only by inputting the personal identification number, and the labor of the user is saved.

  The operation of the CPU 12 of the telephone set A in the embodiment of FIG. 1 will be described below using the flowcharts shown in FIGS.

  When the “INVITE” message as shown in FIG. 4 is transmitted from the telephone set B, the “INVITE” message is received in step S1 of FIG. 9, and the “INVITE” message is analyzed in step S3. In step S 5, the reply destination information RI is extracted from the “INVITE” message and stored in the RAM 22. In step S 7, a “180 Ringing” message indicating that the user of the telephone A is being called is transmitted to the telephone B.

  In step S9, a ringing tone for the user of the telephone A is generated. In step S11, it is determined whether the ringing tone has been generated ten times, for example. If YES is determined in step S11, the answering machine function is activated, and in step S15, a “200 OK” message is transmitted to the telephone set B to notify that the request by the “INVITE” message is successful. In step S17, the telephone set B receives an “ACK” message indicating that the telephone set B has received the “200 OK” message.

When the “ACK” message is received, RT is exchanged with the telephone set B in step S19.
P packet (voice) transmission / reception is started, and in step S21 of FIG. 10 , “I am out now. Please tell me your name, contact information, and business after the beeping sound.” Start sending such announcements. When the “#” button is operated from the telephone set B during the announcement, the push sound of the “#” button is transmitted to the telephone set A, and it is determined that the “#” button is operated in step S23. Send an announcement like "Please enter your number". When a personal identification number is input to telephone B in response to this announcement, a push sound corresponding to the personal identification number is transmitted to telephone A, and a push sound is detected in step S27. In step S29, it is determined whether or not the personal identification number specified from the push sound detected in step S27 matches the personal identification number registered in the telephone A in advance. If YES is determined in the step S29, an announcement such as “Transfer setting operation accepted” is transmitted in a step S31.

  The user of the telephone set B who has heard this announcement places the handset 36 of the telephone set B and ends the call. Then, the telephone B transmits a “BYE” message requesting the end of the call, and the telephone A receives the “BYE” message in step S33 of FIG. When the “BYE” message is received, in step S35, a “200 OK” message indicating that the call termination request by the “BYE” message is successful is transmitted to the telephone set B, and the call is terminated.

  When the call is finished, in step S37, transfer source information FI (see FIG. 6; IP address of telephone A) is generated from own apparatus information OI recorded in EEPROM 20 of telephone A. In step S39, transfer destination information TI (see FIG. 6; IP address of telephone set B) is generated from the reply destination information RI extracted from the “INVITE” message in step S5 of FIG. In step S41, authentication information AI (see FIG. 6) is generated using the user ID ui and password PS recorded in the EEPROM 20 of the telephone set A.

  In step S43, the “REGISTER” message as shown in FIG. 6 is created using the transfer source information FI, the transfer destination information TI and the authentication information AI generated in steps S37, 39 and 41. In step S45, This “REGISTER” message is transmitted to the registration server 40. In step S47, a “200 OK” message indicating that the transfer setting request by the “REGISTER” message is successful is received from the registration server 40 that has received the “REGISTER” message, and the process returns to step S1 in FIG.

  On the basis of the “REGISTER” message transmitted from the telephone set A, the registration server 40 performs transfer setting of the call for the telephone set A to the telephone set B. Thereby, the setting for transferring the call made to the telephone A to the telephone B is completed.

  As described above, according to the telephone A of this embodiment, the transfer setting for transferring the call made to the telephone A to the telephone B is performed only by inputting the personal identification number from the telephone B of the transfer destination. Therefore, the user's trouble can be saved.

  The above-described embodiment can be variously changed. For example, in the above example, the communication terminal to which the present invention is applied is an IP telephone. However, the present invention is not limited to an IP telephone, and is an IP adapter that is used by being connected between a normal general subscriber telephone and an IP network. Also good.

  In the above-described embodiment, the telephone set B and the telephone set C are described as IP telephones. However, the telephone set B and the telephone set C may be ordinary general subscriber phones that can make push sounds. In this case, a VoIP gateway is provided between the general public network and the IP network.

  Furthermore, in the above-described embodiment, in order to transfer the call made to the telephone A to the telephone B, the IP corresponding to the telephone number of the telephone A in the correspondence table 40b held in the database 40a of the registration server 40 is used. The address was rewritten from the IP address of telephone A to the IP address of telephone B. However, instead of rewriting the IP address of the telephone A with the IP address of the telephone B, information indicating that the correspondence destination of the telephone number of the telephone A is changed is recorded in the correspondence table 40b, and the correspondence destination to be changed is The IP address of the telephone set B may be recorded.

  Further, a telephone number may be adopted as the address information, and the correspondence destination of the telephone number of the telephone A to be changed in the correspondence table 40b may be the telephone number of the telephone B instead of the IP address of the telephone B.

It is an illustration figure which shows the whole structure of one Example of this invention. It is a block diagram which shows the example of schematic structure of an IP telephone. 6 is an illustrative view showing an example of a SIP message transmitted / received between a telephone set A and a telephone set B. It is an illustration figure which shows the example of an INVITE message. 4 is an illustrative view showing an example of a SIP message transmitted / received between a registration server and a telephone set A. FIG. It is an illustration figure which shows the example of a REGISTER message. It is an illustration figure which shows the procedure of the transfer setting in the conventional IP telephone. It is an illustration figure which shows the other procedure of the transfer setting in the conventional IP telephone. It is a flowchart which shows operation | movement of CPU of the telephone A in the Example of FIG. FIG. 10 is a flowchart following the flowchart of FIG. 9. It is a flowchart following the flowchart of FIG.

Explanation of symbols

A, B, C ... IP telephone 12 ... CPU
18 ... Keypad 20 ... RAM
22… EEPROM
40 ... Registration server (server)
50 ... Proxy server

Claims (7)

A communication terminal that is assigned a identification number and address information on a communication network and establishes a connection with a desired communication terminal using a server that manages a correspondence table in which a correspondence relationship between the identification number and the address information is described In
Establishing means for establishing a connection with a requesting communication terminal when a connection request is received in a state in which a standby mode is set, and a specific signal from the requesting communication terminal after the connection is established by the establishing means And a transmission means for transmitting to the server a request signal requesting to change the correspondence destination of the identification number from the address information of the request source to the address information of the requesting communication terminal in the correspondence table. A communication terminal characterized by that. A first holding means for holding the first secret code;
The specific signal includes a second secret code;
The transmission unit transmits the request signal to the server when a predetermined relationship is satisfied between a first secret code held by the first holding unit and a second secret code included in the specific signal. Item 1. A communication terminal according to Item 1. Further comprising second holding means for holding an access code for accessing the server;
The communication terminal according to claim 1, wherein the request signal includes an access code held by the second holding unit. The identification number is a telephone number;
The communication terminal according to claim 1, wherein the communication network is an IP network, and the address information is an IP address.   The communication terminal according to claim 1, wherein the standby mode is an answering machine mode. The communication terminal according to claim 3 , wherein the access code includes a user ID and a password. And further comprising third holding means for holding the address information of the user,
It said connection request comprising said address information, communication terminal according to any one of claims 1 to 6 where the third holding means of said requesting communication terminal held.

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