JP4924134B2 - IP call system, IP terminal, conversation complementing method and conversation complementing program when disconnecting call - Google Patents

Description

  The present invention relates to an apparatus and method for making a call over an IP network, and in particular, an IP call system capable of transmitting a message to a communication partner when a call is cut off in the middle, an IP terminal, and conversation complementation when the call is disconnected The present invention relates to a method and a conversation completion program.

  Conventionally, when a message is to be transmitted to a terminal not connected to a network, a method of leaving a message by an answering machine service or the like is used. The answering machine service is a service in which when a call is made to a terminal not connected to the network, the message of the speaker who made the call is stored in a server and the message can be acquired later.

  The conventional answering machine service cannot leave a message immediately if the connection is disconnected after the call is established. In order to leave a message in such a case, it is necessary to call the disconnected party again, and if the connection is not restored when the call is made again, a message can be left on the answering machine.

  In addition, in a conventional IP phone call, if one of the speakers is disconnected for some reason, the call is immediately disconnected and terminated in the middle of the conversation. Even if the speaker re-calls the phone to resume the conversation that ended halfway, the connection cannot be established if both speakers are re-calling at the same time.

  In addition, there is a case where the communication state is not improved from the disconnected state even if the call is made again, and the call cannot be made. If you are unable to connect even if you call again, you may leave a message on the answering machine service, or if the terminal can use the e-mail function, the requirement may be communicated by e-mail.

  However, in both cases, various operations must be performed after the call is disconnected, and the interrupted conversation cannot be resumed smoothly.

  In particular, when a call is disconnected in a state where a message is completed after only one word is transmitted, the process of leaving a message through various actions as described above is very troublesome.

  The reason why the call is disconnected in the IP phone is that the connection location of one of the speakers is congested. In addition, when an IP phone is connected via a wireless LAN, it may be disconnected due to wireless crosstalk.

There are inventions disclosed in Patent Literatures 1 to 4 as conventional techniques for transmitting a message to a communication partner when a call is interrupted.
JP 2000-184443 A Japanese Patent Laid-Open No. 10-190841 JP 7-66872 A JP-A-9-116630

  However, the inventions disclosed in Patent Documents 1 to 3 assume a case where the connection is disconnected depending on the radio wave condition in the mobile terminal. That is, Patent Documents 1 to 3 include an exchange as a system configuration and assume a telephone network (circuit exchange type communication) as a network, and a base station or an exchange detects disconnection. However, such a configuration cannot cope with a call using IP (packet-switched call) that has been spreading in recent years. For example, in the case of a voice chat program that performs peer-to-peer communication, the techniques of Patent Documents 1 to 3 cannot be applied, and therefore the reason for opening the line cannot be determined.

  Further, since the invention disclosed in Patent Document 4 is a closed system in the telephone network, it can be applied only to circuit-switched communication.

  Thus, conventionally, there has not been provided an IP call system that can transmit a message to a communication partner when a call through an IP network is cut off.

  The present invention has been made in view of such a problem, and an IP call system, an IP terminal, and a conversation complementing method at the time of call disconnection that can transmit a message to a communication partner when a call through the IP network is cut off in the middle And to provide a conversation supplement program.

  In order to achieve the above object, the present invention provides, as a first aspect, two or more terminals, a message management server that stores message data addressed to another terminal from any terminal, a call between terminals, and a terminal; Each IP communication system is connected to an IP network with a session management server that manages communication with a message management server by call control, and each terminal communicates when communication with another terminal is disconnected. Either the other party terminal status inquiry unit that inquires of the session management server whether the other party terminal has been disconnected from the IP network, and either the own terminal or the other party terminal is disconnected from the IP network according to the inquiry result of the other party terminal status inquiry unit If the determination means for determining whether the terminal has been disconnected and the determination means determine that the terminal is not disconnected from the IP network, the message data to the communication partner terminal is transmitted. There is provided an IP call system; and a message transmission means for transmitting to the management server.

  In the first aspect of the present invention, it is preferable that the determination unit determines that the own terminal is disconnected from the IP network when a response to the inquiry by the counterpart terminal status inquiry unit cannot be obtained from the session management server. The message transmission means requests the session management server to transmit a message to the communication partner terminal, and transmits message data to the communication partner terminal to the address notified from the session management server in response to the request. Preferably, in addition to this, the session management server that has received the request output from the message transmission means notifies the message management server that the message to the communication partner terminal will be transmitted to the requesting terminal. It is more preferable to notify the address of the message management server. Each terminal, when disconnected from the IP network and reconnected to the IP network, reconnection notification means for notifying the session management server of the reconnection, and a message addressed to the terminal from the session management server. Means for requesting the message management server to transmit message data addressed to the terminal when the message management server is notified that the data is stored in the message management server. If the message is sent to the terminal, the message management server inquires whether the message data addressed to the terminal is stored, and that the message data addressed to the terminal that has notified the reconnection is stored. When notified from the message management server, it is preferable to have means for notifying the reconnected terminal to that effect. The message data preferably includes at least one of audio data and video data. Each terminal has means for inquiring of the user whether or not to transmit message data when it is determined that the terminal is not disconnected from the IP network, and the message transmission means transmits the message data. Message data is preferably transmitted to the message management server when is selected by the user.

  In order to achieve the above object, as a second aspect, the present invention provides a communication partner terminal when communication with another terminal via the IP network is disconnected from the other terminal. The other party terminal status inquiry means for inquiring to the session management server connected to the IP network whether the terminal has been disconnected from the IP network, and either the terminal or the communication partner terminal is in accordance with the inquiry result by the counterpart terminal status inquiry means. A message management unit that determines whether or not the terminal is disconnected from the network and a message management unit that connects the message data to the communication partner terminal when the determination unit determines that the terminal is not disconnected from the IP network. An IP terminal characterized by having a message transmission means for transmitting to a server is provided.

  In the second aspect of the present invention, it is preferable that the determining means determines that the own terminal is disconnected from the IP network when a response to the inquiry by the counterpart terminal status inquiry means cannot be obtained from the session management server. The message transmission means requests the session management server to transmit a message to the communication partner terminal, and transmits message data to the communication partner terminal to the address notified from the session management server in response to the request. It is preferable. In addition, when reconnecting to the IP network after being disconnected from the IP network, reconnection notification means for notifying the session management server of reconnection, and message data addressed to the terminal from the session management server It is preferable to have means for requesting the message management server to transmit message data addressed to the terminal when it is notified that the message is stored in the server. The message data preferably includes at least one of audio data and video data. In addition, when it is determined that the terminal is not disconnected from the IP network, it has means for inquiring the user whether or not to send message data, and the message transmission means selects by the user to send the message data In such a case, it is preferable to transmit the message data to the message management server.

  In order to achieve the above object, according to a third aspect of the present invention, there is provided a conversation complementing method at the time of call disconnection in an IP terminal having a function of communicating via an IP network. When communication with the terminal is disconnected, a process of inquiring to the session management server that manages the communication of the terminal by call control as to whether the communication partner terminal is disconnected from the IP network; According to the inquiry result in the inquiry process, in the process of determining which of the own terminal or the communication partner terminal is disconnected from the IP network, and in the determination process that the IP terminal is not disconnected from the IP network A message transmission process for transmitting message data to a message management server for storing message data to a communication partner terminal when it is determined. It is intended to provide.

  In the third aspect of the present invention, in the determination step, the IP terminal determines that the terminal is disconnected from the IP network when a response to the inquiry in the counterpart terminal status inquiry step cannot be obtained from the session management server. It is preferable. Further, in the message transmission step, the IP terminal requests the session management server to transmit a message to the communication partner terminal, and responds to the address notified from the session management server to the communication partner terminal in response to the request. It is preferable to transmit message data. In addition, when the IP terminal is reconnected to the IP network after being disconnected from the IP network, a reconnection notification process for notifying the session management server of the reconnection, and the IP terminal It is preferable to have a step of requesting the message management server to transmit message data addressed to the terminal when it is notified that the message data addressed to the terminal is stored in the message management server. The message data preferably includes at least one of audio data and video data. In addition, when the IP terminal determines that the terminal is not disconnected from the IP network, the IP terminal has a step of inquiring the user whether to transmit message data. In the message transmission step, the IP terminal When data transmission is selected by the user, it is preferable to transmit the message data to the message management server.

  In order to achieve the above object, according to a fourth aspect of the present invention, there is provided a program that causes a substantial computer that controls an IP terminal having a function of communicating via an IP network to perform a conversation complement process when a call is disconnected. A session management server that manages the communication of its own terminal by call control to determine whether the communication partner's terminal is disconnected from the IP network when communication with another terminal is disconnected in a substantial computer. In response to the inquiry result in the partner terminal status inquiry step, the step of determining which of the own terminal and the communication partner terminal is disconnected from the IP network, and the own terminal is not disconnected from the IP network Message transmission step for transmitting to the message management server for storing message data to the communication partner terminal. There is provided a conversation complementary program characterized.

  In the fourth aspect of the present invention, when the substantial computer cannot obtain a response to the inquiry in the counterpart terminal status inquiry step from the session management server in the determination step, the computer is disconnected from the IP network. It is preferable to judge. Further, in the message transmission process, the substantial computer requests the session management server to transmit a message to the communication partner terminal, and responds to the request to the address notified from the session management server. It is preferable to send the message data to. In addition, when the own terminal is reconnected to the IP network after the terminal is disconnected from the IP network, a reconnection notification step of notifying the session management server of the reconnection, When notified that the message data addressed to the terminal is stored in the message management server, it is preferable to cause the message management server to execute a step of requesting transmission of message data addressed to the terminal. The message data preferably includes at least one of audio data and video data. In addition, when it is determined that the actual terminal is not disconnected from the IP network, the substantial computer is caused to execute a step of inquiring the user whether or not to transmit the message data. The computer preferably transmits the message data to the message management server when the user selects to transmit the message data.

  According to the present invention, it is possible to provide an IP call system, an IP terminal, a conversation complementing method and a conversation complementing program that are capable of transmitting a message to a communication partner when a call through the IP network is interrupted.

[First Embodiment]
A first embodiment in which the present invention is suitably implemented will be described. The IP call system according to the present embodiment has a configuration in which two terminals 101, a session management server 108, and a message management server 109 are connected via a network 107.

The terminal 101 is a device capable of making a call using IP such as an IP phone, a soft phone, a Web conference program, a computer that executes a voice / video chat program, and the like.
A user interface (UI) unit 102, a disconnection detection unit 103, a voice processing unit 104, and a communication unit 105 are included.
Note that the terminal 1 and the terminal 2 have the same configuration.

  The UI unit 102 provides an input interface for a basic operation such as a telephone call to the speaker, and also provides an output interface during an operation of transmitting a notification or message from the disconnection detection unit 103 to the message management server 109. To do. The output interface may be a graphical interface (GUI) by screen display or a voice user interface. As the speaker input interface, buttons, voice recognition, and the like can be applied.

  The disconnection detection unit 103 detects whether a problem has occurred in the connection of the terminal itself, or has been disconnected due to a problem in the communication partner terminal. When only the communication partner terminal is disconnected, since the terminal itself is normally connected to the network 107, the message can be transmitted to the message management server 109. When only the communication partner terminal is disconnected, the disconnection detection unit 103 inquires of the speaker whether to transmit a message to the message management server 109 through the UI unit 102.

  The audio processing unit 104 performs audio processing necessary for audio capture, audio reproduction, acoustic processing, encoding, decoding, and the like.

  The communication unit 105 transmits the voice data created by the voice processing unit 104 to the partner terminal, transmits the message similarly created by the voice processing unit 104 to the message management server 109, or from the communication partner terminal. Receives audio data and communicates to detect disconnection.

  The network 107 is an IP network such as a corporate network, the Internet, and a next-generation network (NGN).

  The session management server 108 controls calls between terminals by call control. Further, when the terminal 101 transmits a message to the message management server 109, a process for establishing a connection between the terminal 101 and the message management server 109 is performed.

  Terminal 101, session management server 108, and message management server 109 are each connected to network 107. The connection form between the terminal 101 and the network 107 may be either wired or wireless. On the other hand, the connection between the session management server 108 and message management server 109 and the network 107 is a wired connection from the viewpoint of robustness. The session management server 108 and the message management server 109 may be connected via the network 107 or may be directly connected.

FIG. 2 shows a flow of processing until the message is transmitted to the message management server 109 when the own terminal or the communication partner terminal is disconnected from the network 107.
Step S201: A call between the terminal and the communication partner terminal is started. Processing up to the start of a call may be performed by SIP.
Step S202: When the own terminal or the communication partner terminal is disconnected from the network 107, it is detected whether the own terminal is disconnected or the communication partner terminal is disconnected. This operation is performed by the cutting detection unit 103.
Step S203: It is determined whether the local terminal is disconnected from the network 107 or the communication partner terminal is disconnected from the network 107.
Step S204: Since the communication partner terminal is disconnected from the network 107, the speaker is inquired whether or not to send a message to the communication partner terminal to the message management server 109. Inquiries to the speaker are made via the UI unit 102. The inquiry may be in the form of answering with Yes / No. Note that the inquiry may be omitted and the process may be automatically shifted to a message transmission process. In the case of automatically shifting to the message transmission process, it is preferable to notify the speaker that the message input is requested and to cancel the message when the speaker does not wish to transmit the message.
Step S205: Since the terminal is disconnected from the network and cannot transmit a message to the message management server 109, the process is terminated after notifying the speaker that the terminal is disconnected from the network 107.
Step S206: It is determined whether or not to transmit a message to the message management server 109.
Step S207: A message to the communication partner terminal is transmitted to the message management server 109.

Next, the flow of the cutting detection process in step S203 will be described with reference to FIG.
When the terminal 2 is disconnected from the network 107 while the terminal 1 and the terminal 2 are talking, both the terminal 1 and the terminal 2 do not receive voice data from the partner terminal. Using this as a trigger, both terminals inquire to the session management server 108 about the status of the communication partner terminal, that is, whether or not the communication partner terminal is disconnected from the network 107.

  The inquiry from the terminal 2 to the session management server 108 does not reach the session management server 108 because the terminal 2 is disconnected from the network 107. Therefore, since the terminal 2 cannot receive a response from the session management server 108, the disconnection detection unit 103 recognizes that the terminal 2 has been disconnected from the network 107.

  On the other hand, an inquiry from the terminal 1 to the session management server 108 reaches the session management server 108 because the terminal 1 is connected to the network 107. Upon receiving the inquiry from the terminal 1, the session management server 108 inquires of the terminal 2 about the connection status. At this time, since the terminal 2 is disconnected from the network 107, the connection status inquiry from the session management server 108 does not reach the terminal 2. Therefore, the session management server 108 recognizes that the terminal 2 is disconnected from the network 107 and notifies the terminal 1 of this. The disconnection detection unit 103 of the terminal 1 recognizes that the terminal 2 is disconnected from the network 107 by being notified from the session management server 108 that the terminal 2 is disconnected from the network 107.

Next, with reference to FIG. 4, the operation for transmitting a message to the communication partner terminal in step S207 to the message management server 109 will be described.
The terminal 1 requests the session management server 108 to transmit a message to the terminal 2. Upon receiving this request, the session management server 108 notifies the message management server 109 that a message from the terminal 1 to the terminal 2 is transmitted, and then notifies the terminal 1 of the destination of the message management server 109. The terminal 1 receives the notification of the destination of the message management server 109 from the session management server 108 and transmits the message to the message management server 109. The message is created from the voice data created by the voice processing unit 104 as in a normal call, and transmitted to the message management server 109 by the communication unit 105.

Next, an operation in which the terminal 101 that has recovered from the state disconnected from the network 107 acquires a message stored in the message management server 109 will be described with reference to FIG.
After the cause of the disconnection from the network 107 is resolved, the terminal 2 notifies the session management server 108 that it has reconnected after connecting to the network 107 again. The session management server 108 inquires of the message management server 109 whether there is a message addressed to the terminal 2. The message management server 109 notifies the session management server 108 that there is a message addressed to the terminal 2 from the terminal 1. The session management server 108 receives the notification from the message management server 109, notifies the terminal 2 that there is a message from the terminal 1, and simultaneously notifies the destination of the message management server 109. When the terminal 2 acquires a message, the terminal 2 requests the message management server 109 to transmit the message. The message management server 109 transmits a message addressed to the terminal 2 in response to a request from the terminal 2.

  When there are a plurality of messages addressed to the terminal 2, the message management server 109 requests the terminal 2 to select which message to acquire. Upon receiving this request, the terminal 2 urges selection of a speaker via the UI unit 102 and transmits information indicating the selected message to the message management server 109. The message management server 109 transmits only the selected message to the terminal 2.

  In the above description, the case where the terminal 2 is disconnected from the network 107 and the terminal 1 transmits a message addressed to the terminal 2 is described as an example, but the operation when the terminal 1 is disconnected from the network 107 is the same. Needless to say.

  As described above, the IP call system according to the present embodiment detects whether the own terminal or the communication partner terminal has been disconnected from the IP network when the call is disconnected in the middle of the conversation, and can be normally connected. Can send messages immediately. That is, when a call is disconnected in the middle of a conversation, a message that complements the broken conversation can be transmitted immediately. Also, a terminal disconnected from the IP network can acquire a message addressed to itself immediately after returning. For this reason, it is possible to supplement the requirements that could not be communicated, and the conversation can be resumed smoothly when the next call is made.

[Second Embodiment]
A second embodiment in which the present invention is suitably implemented will be described.
In the first embodiment, an example has been described in which a conversation that is disconnected when two terminals are connected to the network and a one-to-one call is made is complemented. The present invention can cope with a case where one or a plurality of terminals are disconnected from the network when two or more terminals are connected to the network and are making a many-to-many call. This case will be described as an example.
FIG. 6 shows the configuration of the IP call system according to the present embodiment. This system has a configuration in which an unspecified number of N terminals 601 are connected to the network 605. Here, N = 4 will be described. Note that the configuration of each terminal is the same as that of the first embodiment, and a description thereof will be omitted.

It is assumed that the terminals 2 and 3 are disconnected from the network 605 when the terminals 1 to 4 are talking. In this case, since the terminal 1 and the terminal 4 do not receive the voice data from the terminal 2 and the terminal 3, the terminal 1 and the terminal 4 inquire the communication status of the terminals 2 and 3 to the session management server 606.
The session management server 606 receives the inquiry from the terminal 1 and the terminal 4 and confirms the communication state of the terminal 2 and the terminal 3. At this time, since the terminal 2 and the terminal 3 are disconnected from the network 605, the session management server 606 cannot confirm the communication state of the terminal 2 and the terminal 3. Therefore, the session management server 606 notifies the terminal 1 and the terminal 4 that the terminal 2 and the terminal 3 are disconnected from the network 605.
When the terminal 1 and the terminal 4 recognize that the terminal 2 and the terminal 3 are disconnected from the network 605, the terminal 1 and the terminal 4 transmit messages to the terminal 2 and the terminal 3 to the message management server 607. In this case, the basic message transmission method is the same as in the first embodiment. However, since there are two terminals, terminal 2 and terminal 3, here, even if a message is created separately for each terminal. It's good, and you can have two destinations with one message.

  Since the terminal 2 and the terminal 3 are disconnected from the network 605, they no longer receive audio data from terminals other than their own terminals. Therefore, the terminal 2 inquires of the session management server 606 about the communication state of the terminal 1, the terminal 3, and the terminal 4. Since the terminal 2 is disconnected from the network 605, an inquiry response is not obtained, thereby recognizing that the terminal 2 is disconnected from the network 605. Similarly, the terminal 3 inquires of the session management server 606 about the communication state of the terminal 1, the terminal 2, and the terminal 4, and recognizes that its own terminal has been disconnected from the network 605 because no response is obtained.

  Since other aspects are the same as those in the first embodiment, a duplicate description is omitted.

  As described above, in the IP call system according to the present embodiment, when two or more terminals connected to the IP network are making a many-to-many call, one or more terminals are disconnected from the IP network. Even so, a terminal not disconnected from the IP network can immediately transmit a message addressed to the terminal disconnected from the IP network. Also, a terminal disconnected from the IP network can acquire a message addressed to itself immediately after returning.

[Third Embodiment]
A third embodiment in which the present invention is preferably implemented will be described.
FIG. 7 shows a configuration of a terminal applied to the IP call system according to the present embodiment. The terminal 701 includes a UI unit 702, a disconnection detection unit 703, a video / audio processing unit 704, and a communication unit 705. The video / audio processing unit 704 includes a video processing unit 706 and an audio processing unit 707. The video / audio processing unit 704 creates video data and audio data from the captured video and audio, and transmits the created video data and audio data via the communication unit 705. The video / audio processing unit 704 performs processing of video data and audio data received by the communication unit 705, video display, and audio reproduction.

  The terminal 701 can use the videophone function by using the video / audio processing unit 704. In the above embodiment, the message is a voice, but in this embodiment, it is possible to make a message by combining video and audio.

  Since the method for transmitting and acquiring the message is the same as that in the above embodiment, a duplicate description is omitted.

  Each of the above embodiments is an example of a preferred embodiment of the present invention, and the present invention is not limited to this and can be variously modified.

It is a figure which shows the structure of the IP telephone call system which concerns on 1st Embodiment which implemented this invention suitably. It is a flowchart which shows the flow of operation | movement at the time of the telephone call disconnection of the IP telephone system which concerns on 1st Embodiment. It is a figure which shows the specific example of the operation | movement which detects a cutting | disconnection. It is a figure which shows the specific example of the operation | movement which a terminal transmits message data to a message management server. It is a figure which shows the specific example of the operation | movement which the terminal which reset | restored from the disconnection acquires a message from a message management server. It is a figure which shows the structure of the IP telephone call system which concerns on 2nd Embodiment which implemented this invention suitably. It is a figure which shows the structure of the terminal applied to the IP telephone system which concerns on 3rd Embodiment which implemented this invention suitably.

Explanation of symbols

101, 601, 701 Terminal 102, 702 UI unit 103, 703 Disconnection detection unit 104, 707 Audio processing unit 105, 705 Communication unit 107, 605 Network 108, 606 Session management server 109, 607 Message management server 704 Video / audio processing unit 706 Video processing unit

Claims (25)

A session that manages two or more terminals, a message management server that stores message data addressed to another terminal from any one of the terminals, and communication between the terminals and communication between the terminals and the message management server by call control An IP call system in which each of the management servers is connected to an IP network,
Each terminal is
A partner terminal status inquiry means for inquiring of the session management server whether the terminal of the communication partner is disconnected from the IP network when communication with another terminal is disconnected;
Judgment means for judging which of the own terminal and the communication partner terminal is disconnected from the IP network according to the inquiry result by the partner terminal status inquiry means;
A message transmission unit configured to transmit message data to the communication partner terminal to the message management server when the determination unit determines that the terminal is not disconnected from the IP network; Call system.   2. The IP according to claim 1, wherein the determination unit determines that the own terminal is disconnected from the IP network when a response to the inquiry from the counterpart terminal status inquiry unit cannot be obtained from the session management server. Call system.   The message transmission means requests the session management server to transmit a message to the communication partner terminal, and in response to the request, message data to the communication partner terminal addressed to the address notified from the session management server. The IP call system according to claim 1, wherein the IP call system is transmitted.   The session management server that has received the request output from the message transmission means notifies the message management server that a message to the communication partner terminal is to be transmitted, and sends the message management server to the requesting terminal. 4. The IP call system according to claim 3, wherein the address is notified. Each terminal is
Reconnection notifying means for notifying the session management server of reconnection when reconnected to the IP network after being disconnected from the IP network;
Means for requesting the message management server to transmit the message data addressed to the own terminal when notified from the session management server that the message data addressed to the own terminal is stored in the message management server; Have
The session management server
Means for inquiring of the message management server whether or not message data addressed to the terminal is stored when reconnection is notified from any of the terminals;
And a means for notifying the reconnected terminal when the message management server notifies that the message data addressed to the terminal that has notified the reconnection is stored. The IP call system according to any one of claims 1 to 4.   6. The IP call system according to claim 1, wherein the message data includes at least one of audio data and video data. Each terminal has means for inquiring of a user whether or not to transmit message data when it is determined that the terminal is not disconnected from the IP network,
The IP call according to any one of claims 1 to 6, wherein the message transmission means transmits the message data to the message management server when transmission of message data is selected by the user. system. Means for communicating with other terminals via an IP network;
A partner terminal status inquiry means for inquiring of a session management server connected to the IP network whether or not the terminal of the communication partner is disconnected from the IP network when communication with another terminal is disconnected;
Judgment means for judging which of the own terminal and the communication partner terminal is disconnected from the IP network according to the inquiry result by the partner terminal status inquiry means;
Message transmitting means for transmitting message data to the communication partner terminal to a message management server connected to the IP network when the determining means determines that the terminal is not disconnected from the IP network; An IP terminal comprising:   9. The IP according to claim 8, wherein the determination unit determines that the own terminal is disconnected from the IP network when a response to the inquiry from the counterpart terminal status inquiry unit cannot be obtained from the session management server. Terminal.   The message transmission means requests the session management server to transmit a message to the communication partner terminal, and in response to the request, message data to the communication partner terminal addressed to the address notified from the session management server. The IP terminal according to claim 8 or 9, wherein the IP terminal is transmitted. Reconnection notifying means for notifying the session management server of reconnection when reconnected to the IP network after being disconnected from the IP network;
Means for requesting the message management server to transmit the message data addressed to the own terminal when notified from the session management server that the message data addressed to the own terminal is stored in the message management server; The IP terminal according to claim 8, comprising:   The IP terminal according to any one of claims 8 to 11, wherein the message data includes at least one of audio data and video data. When it is determined that the terminal is not disconnected from the IP network, the terminal has a means for inquiring the user whether to transmit message data,
The IP terminal according to any one of claims 8 to 12, wherein the message transmission means transmits message data to the message management server when transmission of message data is selected by a user. . A conversation complementing method at the time of call disconnection in an IP terminal having a function of communicating via an IP network,
A step of inquiring a session management server managing communication of the terminal by call control as to whether or not the communication partner terminal is disconnected from the IP network when communication with the other terminal is disconnected; ,
A step of determining whether the IP terminal is disconnected from the IP network according to an inquiry result in the counterpart terminal status inquiry step;
A message transmission step of transmitting to the message management server for storing message data to the communication partner terminal when the IP terminal determines in the determination step that the terminal is not disconnected from the IP network; A conversation complementing method at the time of call disconnection characterized by comprising:   In the determining step, the IP terminal determines that the terminal is disconnected from the IP network when a response to the inquiry in the partner terminal status inquiry step cannot be obtained from the session management server. The conversation complementing method at the time of call disconnection according to claim 14.   In the message transmission step, the IP terminal requests the session management server to transmit a message to the communication partner terminal, and responds to the communication partner to the address notified from the session management server. The message complementing method at the time of call disconnection according to claim 14 or 15, wherein message data is transmitted to the terminal. A reconnection notification step of notifying the session management server of reconnection when the IP terminal is reconnected to the IP network after being disconnected from the IP network;
When the IP terminal is notified by the session management server that message data addressed to the terminal is stored in the message management server, the message data is transmitted to the message management server. 17. The method for complementing conversation when disconnecting a call according to any one of claims 14 to 16, further comprising the step of:   The conversation complementing method at the time of call disconnection according to any one of claims 14 to 17, wherein the message data includes at least one of audio data and video data. When the IP terminal determines that the terminal is not disconnected from the IP network, the IP terminal inquires the user whether to transmit message data;
19. In the message transmission step, the IP terminal transmits message data to the message management server when transmission of message data is selected by a user. The conversation complementing method when disconnecting a call according to item 1. A program for causing a substantial computer that controls an IP terminal having a function of communicating via an IP network to perform a conversation complementing process when a call is disconnected,
When the communication with the other terminal is disconnected, the substantial computer is inquired of the session management server that manages the communication of the terminal by call control as to whether the communication partner terminal is disconnected from the IP network. Process,
Determining which one of the own terminal and the communication partner terminal is disconnected from the IP network according to the inquiry result in the partner terminal status inquiry step;
A message transmission step of transmitting to the message management server for storing message data to the terminal of the communication partner when the terminal determines that the terminal is not disconnected from the IP network. A featured conversation completion program.   In the determination step, the substantial computer determines that the terminal is disconnected from the IP network when a response to the inquiry in the counterpart terminal status inquiry step cannot be obtained from the session management server. The conversation complementing program according to claim 20.   In the message transmission step, the substantial computer requests the session management server to transmit a message to the communication partner terminal, and addresses the address notified from the session management server in response to the request. The conversation complementing program according to claim 20 or 21, wherein message data is transmitted to a terminal of a communication partner. A reconnection notifying step of notifying the session management server of reconnection when the terminal is reconnected to the IP network after being disconnected from the IP network;
A step of requesting the message management server to transmit message data addressed to the own terminal when notified from the session management server that the message data addressed to the own terminal is stored in the message management server; 23. The conversation complementing program according to claim 20, wherein the program is executed.   The conversation complementing program according to any one of claims 20 to 23, wherein the message data includes at least one of audio data and video data. When the substantial computer determines that the terminal is not disconnected from the IP network, it executes a step of inquiring the user whether or not to transmit message data;
25. In the message transmission step, the substantial computer transmits message data to the message management server when transmission of message data is selected by a user. The conversation complementing program according to any one of the preceding claims.

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