JP2014183432A - Synchronous inquiry service providing device, synchronous inquiry service providing method, and synchronous inquiry service providing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the convenience of an inquiry service.SOLUTION: A distribution server 7 associates and stores user related information each user can learn with the IP address of each user terminal 1, receives inquiry information from a user, determines the user terminals 1 of users that can give an answer on the basis of the user related information on each user, sets transfer routing information for transferring a signal destined to a multicast address to each of the user terminals to an intermediate network device 3 accommodating the determined respective user terminals 1, transmits a call control signal to the multicast address to make the intermediate network device 3 perform concurrent call origination only to the determined respective user terminals 1, and establishes voice communication between the user terminals 1 that made a response to the call origination and the user terminal 1 that transmitted the inquiry information.

Description

  The present invention relates to a technique for providing a question service.

  In recent years, with the rise of broadband, a question service that provides answer information answered by an unspecified number of users with respect to question information sent from users has become widespread. For example, by writing a question on a website browsed by an unspecified number of users, even if there are no people familiar with the question in the vicinity of the user who asked the question, expecting and obtaining a desired answer on the website Can do.

“Tell me! Goo”, NTT Resonant Corporation, [online], [Search February 25, 2013], <URL: http://oshiete.goo.ne.jp/>

  However, since the timing at which the question was asked and the timing at which the answer was made are not synchronized, it was not suitable for a synchronous type question that would like to be solved immediately (the existence of an asynchronous problem).

  In addition, since the user who can answer the question does not always browse the question page in his / her field of expertise, the question content may not match the answer content even if the question is written, and the desired answer can be obtained. The guarantee was low.

  It is conceivable to use a telephone for such a problem. However, the telephone number of a user who can answer a question is usually unknown, and even if a number of unspecified users are called in sequence, there is no guarantee that the user who has received the call will be able to answer the call. End up. In addition, since it is necessary to confirm that no answer is available or busy from each unspecified number of users, a great deal of time is required to obtain an appropriate answer.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the convenience of the question service.

  The synchronous question service providing apparatus according to claim 1, wherein storage means for storing knowledge information that each user can know in association with an identifier of each user terminal, and receiving the question information of the user, said storage means Determining means for determining the user terminal of each user who can reply based on the knowledge information of each user acquired from the above, and a signal addressed to the multicast address to the transfer device accommodating each determined user terminal Setting means for setting transfer information to be transferred to a terminal, a call means for transmitting a call control signal addressed to the multicast address, and causing the transfer apparatus to make a simultaneous call only to each of the determined user terminals, And a establishing means for establishing voice communication between the user terminal that has responded to the call and the user terminal that has transmitted the question information.

  3. The synchronous question service providing apparatus according to claim 2, wherein the setting means transfers the transfer information updated so as not to transfer a signal to the responding user terminal. The gist of the present invention is that the calling unit transmits a disconnection control signal to the multicast, and causes the transfer device to cancel a call to an unanswered user terminal.

  According to a third aspect of the present invention, there is provided a synchronous question service providing method in which a computer stores knowledge information that each user can know in association with an identifier of each user terminal and stores the information in the storage means. A determination step for determining a user terminal of each user who can receive and answer based on the knowledge information of each user acquired from the storage means, and a multicast device addressed to the transfer apparatus accommodating each determined user terminal A setting step for setting transfer information for transferring the above signal to each user terminal, and a call control signal transmitted to the multicast address so that only the determined user terminals can make a simultaneous call. A call origination step and an establishment step for establishing voice communication between the user terminal that responds to the call and the user terminal that transmits the question information. And summarized in that has a flop, a.

  5. The synchronous question service providing method according to claim 4, wherein in the synchronous question service providing method according to claim 3, the setting step transfers the transfer information updated so as not to transfer a signal to the responding user terminal. The gist of the calling step is to send a disconnection control signal to the multicast and cause the forwarding device to cancel the call to the unanswered user terminal.

  The gist of the synchronous question service providing program according to claim 5 is to cause a computer to execute the synchronous question service providing method according to claim 3 or 4.

  According to the present invention, the knowledge information that each user can know is stored in association with the identifier of each user terminal, each user's question information is received, and each user who can answer based on the knowledge information of each user Transfer information for transferring a signal addressed to the multicast address to each of the user terminals is set in a transfer apparatus accommodating each determined user terminal, and a call control signal is addressed to the multicast address. In order to establish voice communication between the user terminal that responds to the call and the user terminal that transmitted the question information. The convenience of the service can be improved.

  According to the present invention, the convenience of the question service can be improved.

It is a figure which shows the whole structure of a synchronous question service provision system. It is a figure which shows the functional block structure of a user terminal. It is a figure which shows the functional block structure of an intermediate network apparatus. It is a figure which shows the functional block structure of a delivery server. It is a figure which shows the registration operation | movement of user related information. It is a figure which shows the example of service subscriber information. It is a figure which shows the example of user characteristic information. It is a figure which shows the provision operation | movement of a question service. It is a figure which shows the example of question reception information. It is a figure which shows the example of multicast address management information. It is a figure which shows the example of transfer routing information. It is a figure which shows the processing operation of a delivery server. It is a figure which shows the processing operation of an intermediate network apparatus. It is a figure which shows the processing operation of a user terminal.

  The present invention accumulates knowledge information that various users can know in advance, determines users who can answer a question sent from any user based on the knowledge information, each determined The system is characterized in that a call is made to answerable users all at once, and voice communication is established between the answering user who has responded to the answering user and the questioning user. Thereby, a synchronous question service can be realized.

  In addition, a multicast address is used when making the simultaneous call. That is, when a call is made to each answerable user, unicast (call to each answerable user individually) or broadcast (all calls including all users who have not been determined as answerable users) ) Is not used, it is possible to realize a synchronous question service while reducing the amount of communication.

  Through these two effects, according to the present invention, as a result, the convenience of the question service can be improved.

  Furthermore, the present invention is characterized in that a call to an unanswered user terminal is canceled (cancelled) so that a call cannot be made with a user other than the user who first answered the call. As a result, voice communication can be established only with the user who first responds to the call, and a one-to-one call can be realized.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different modes and should not be construed as being limited to the description of the present embodiment.

[Configuration of Synchronous Question Service Providing System 100]
FIG. 1 is a diagram showing an overall configuration of a synchronous question service providing system 100 according to the present embodiment. The synchronous question service providing system 100 includes a plurality of user terminals 1 used by each user, a plurality of intermediate network devices 3 accommodating any one of the plurality of user terminals 1, and a plurality of intermediate terminals A router 5 that accommodates the network device 3 and a distribution server 7 that provides a synchronous question service to the user terminal 1 through the intermediate network device 3 and the router 5 are provided.

  FIG. 2 is a diagram illustrating a functional block configuration of the user terminal 1. The user terminal 1 has a telephone function (calling / calling function) using SIP (Session Initiation Protocol) and the like, and a receiving unit for receiving and transmitting information and signals to and from devices other than its own terminal 1 11 and the transmission unit 12, the processing unit 13 that collects user-related information related to the user from web page information browsed by the user, terminal usage information in the LAN, and the like, and accepts input of information input by the user And an input receiving unit 14. For example, it can be realized using a general-purpose personal computer, a home gateway, a service gateway, or the like.

  FIG. 3 is a diagram illustrating a functional block configuration of the intermediate network device 3. The intermediate network device 3 is a transfer device arranged on a communication path between the user terminal 1 and the distribution server 7, and a receiving unit for receiving and transmitting information and signals to and from devices other than the own device 3 31 and the transmission unit 32, the processing unit 33 for controlling the communication path and path information of information and signals exchanged between the user terminal 1 and the distribution server 7, and the user terminal 1 accommodated in the own device 3 A service subscriber information storage unit 34 for management and a transfer routing information storage unit 35 for managing transfer routing information defining a communication path are provided. For example, it can be realized using a switching hub or the like.

  FIG. 4 is a diagram illustrating a functional block configuration of the distribution server 7. The distribution server 7 performs voice communication between the receiving unit 71 and the transmitting unit 72 for receiving and transmitting information and signals with devices other than the server 7, and calling to the user terminal 1 and the user terminal 1. A processing unit 73 to be established, a user feature management unit 74 that manages user-related information transmitted from the user terminal 1, a question reception information storage unit 75 that manages received question reception information, and a multicast address band And a multicast address management unit 76. For example, it can be realized by a computer having a memory and a CPU. Note that the user feature management unit 74 and the multicast address management unit 76 may function on a server other than the distribution server.

[Operation of Synchronous Question Service Providing System 100]
Next, the overall operation of the synchronous question service providing system 100 will be described.

(Registering user-related information)
First, a user-related information registration operation will be described with reference to FIG.

  First, the user terminal 1 transmits user-related information related to the user of the terminal 1 to the distribution server 7, and therefore transmits the user-related information to the intermediate network device 3 located on the communication path to the distribution server 7. (Step S101).

  The user related information is knowledge information that a user can know, and is information related to a field, a place, an interest, a business type, etc. that the user can answer to questions from other users. The user terminal 1 may transmit the knowledge information selected and input by the user who uses the terminal 1 as it is, or may transmit the search keyword frequently used by the user as the knowledge information. Absent.

  Next, the intermediate network device 3 receives the user-related information at the front stage of the distribution server 7, and uses the IP address of the user terminal 1 that is the transmission source of the user-related information as service subscriber information. (Step S102). Thereby, the user terminal 1 which the own apparatus 3 accommodates can be managed. An example of service subscriber information is shown in FIG.

  Next, the intermediate network device 3 adds the ID of the own device 3 (IP address or the like, hereinafter referred to as intermediate network device ID) to the received service related information, and associates the user related information with the intermediate network device ID. Data is transmitted to the distribution server 7 (step S103).

  Finally, the distribution server 7 receives the correspondence data from the intermediate network device 3, and receives the user-related information and the intermediate network device ID included in the correspondence data and the IP of the user terminal 1 obtained from the IP header of the packet. The address is associated and stored in the user feature management unit 74 as user feature information (step S104). An example of user characteristic information is shown in FIG. In this example, in order to manage the user terminal 1 easily, a user ID is given to one record in the user characteristic information.

  The above steps S101 to S104 are executed by each user terminal 1. Accordingly, the distribution server 7 can manage the intermediate network device 3 connected to the server 7 and the user terminal 1 existing under each intermediate network device 3. Moreover, the user related information of the user who is using each user terminal 1 can also be managed.

(Question service provision operation)
Next, the question service providing operation will be described with reference to FIG.

  First, when a question content, question genre, and the like are input by a user, the user terminal 1a of the question user transmits the input data as question information to the distribution server 7 via the intermediate network device 3 (step S201). ).

  Next, the intermediate network device 3 receives the question information at the front stage of the distribution server 7, adds the intermediate network device ID of the own device 3, and distributes correspondence data in which the question information and the intermediate network device ID are associated with each other. It transmits to the server 7 (step S202).

  Next, the distribution server 7 transmits a standby request control signal (SIP 100 trying signal) to the user terminal 1a, which is the source of the question information, in order to notify that the answering user for the received question information is currently being searched. Then, a temporary response is made to the user terminal 1a (step S203).

  At this point, the question user enters a waiting state for the answer user for his / her question. On the other hand, the distribution server 7 thereafter searches for a callable user using the user feature management unit 74 managed by the server 7 and makes a call, and performs voice communication between the answering user who has responded and the questioning user. Execute the process to establish. Details will be described below.

  Next, the distribution server 7 acquires the question information from the received correspondence relationship data, matches the user related information stored in the user feature management unit 74 (for example, keyword matching), and the matching degree is equal to or greater than a threshold value. A user ID (answerable user) is determined and extracted from the user feature management unit 74, and stored in the question reception information storage unit 75 as question reception information in association with the received question information (step S204). An example of the question acceptance information is shown in FIG.

  Next, the distribution server 7 acquires a multicast address that is not currently used from the multicast address management unit 76, and forwards routing information for forwarding information and signals addressed to the multicast address to the user terminal 1 of the answerable user. Is transmitted to the intermediate network device 3 that accommodates the user terminal 1, and the routing is set (step S205).

  An example of the multicast address management information managed by the multicast address management unit 76 is shown in FIG. For the multicast address acquired in step S205, the usage state is changed to being used.

  Next, when the intermediate network device 3 receives the transfer routing information from the distribution server 7, it stores it in the transfer routing information storage unit 35 (step S206). An example of the forwarding routing information is shown in FIG.

  This accumulation process itself is a routing setting process in the intermediate network device 3. Thereafter, the intermediate network device 3 returns response information to the distribution server 7 in order to notify the completion of the routing setting in the own device 3.

  Next, the distribution server 7 receives the response information from all the intermediate network devices 3 that have transmitted the transfer routing information, and then calls the user terminal 1 of each answerable user. A signal (INVITE signal) is transmitted to all the intermediate network devices 3 (step S207). The call control signal is simultaneously transmitted to the corresponding intermediate network device 3 by the router 5 on the communication path.

  Normally, packets addressed to the multicast cast are broadcasted by the router 5, but the intermediate network device 3 that has received the call control signal performs MLD snooping based on the forwarding routing information set in the own device 3, and the multicast It is transferred only to the user terminal 1 that has requested the reception.

  That is, the intermediate network device 3 that has received the call control signal obtains the transfer routing information from the transfer routing information storage unit 35 and collates it with the destination multicast address. The destination address is changed to the IP address of the user terminal 1 included in the transfer routing information and transferred to the user terminal 1 (step S208).

  As a result, the distribution server 7 makes a simultaneous call only to the user terminal 1 of the answerable user. However, when the user terminal 1a of the questioning user who is called in step S201 is included in the user terminal 1, the user terminal 1 is not transferred to the user terminal 1a. MLD (Multicast Listener Discovery) is a protocol for managing multicast groups, and is a known technique.

  Thereafter, all the user terminals 1 that have received the call control signal determine that the call has arrived, notify the user of the terminal 1 by output of a ring tone, and return an incoming call confirmation signal (180 Ringing signal) to the distribution server 7. (Step S209). At this time, the intermediate network device 3 performs only a process of transferring the incoming call confirmation signal.

  Thereafter, when a user out of a plurality of answerable users who are receiving a call responds to the call, the user terminal 1b of the answering user sends a response signal (200 OK signal) to the received call control signal in the distribution server. 7 (step S210). Also at this time, the intermediate network device 3 performs only the process of transferring the response signal.

  Subsequently, the distribution server 7 acquires and stores the IP address of the user terminal 1b that has transmitted the response signal (200 OK signal) from the IP header, and establishes voice communication only with the answering user who responded first, Further, in order not to accept a response signal transmitted from another user terminal 1, the following processing is executed.

  Since the distribution server 7 needs to end communication with the user terminal 1 other than the responding user terminal 1b, a new transfer routing in which the IP address of the user terminal 1b is deleted from the transfer routing information generated in step S205. Information is generated and transmitted only to the intermediate network device 3 that has transmitted the response signal first (step S211).

  Next, the intermediate network device 3 that has received the new transfer routing information stores it in the transfer routing information storage unit 35, thereby resetting the transfer routing information (step S212). Thereafter, the intermediate network device 3 returns response information to the distribution server 7 in order to notify that the routing resetting within the device 3 has been completed.

  Next, the distribution server 7 receives a response signal from the intermediate network device 3 that has transmitted the new transfer routing information, and then transmits a cutoff signal (BYE signal) to all the intermediate network devices 3 addressed to the multicast address. (Step S213).

  Next, the intermediate network device 3 acquires the transfer routing information from the transfer routing information storage unit 35 and collates it with the multicast address of the destination. If the multicast address is included, the intermediate network device 3 transfers the destination address of the call control signal to the transfer routing. The IP address of the user terminal 1 included in the information is changed and transferred to the user terminal 1 (step S214).

  As a result, calls to unanswered user terminals 1 are canceled all at once. However, when the user terminal 1a of the question user is included in the user terminal 1, it is not transferred to the user terminal 1a. Moreover, since the new transfer routing information from which the IP address of the user terminal 1b is deleted is set in the intermediate network device 3 that accommodates the user terminal 1b of the answering user, the user terminal 1b is also notified to the user terminal 1b. It will not be transferred.

  Thereafter, the user terminal 1 that has received the disconnection control signal terminates the output of the ringtone and performs disconnection control, and returns response information to the distribution server 7 in order to notify the completion of the disconnection control.

  Subsequently, after transmitting the disconnection control signal, the distribution server 7 uses the IP address of the user terminal 1b that responds to the call as a transmission source, and includes the IP address and the response signal (200 OK signal) received in step S210. Call transfer information (call control signal) is transmitted to the user terminal 1a of the inquiring user (step S215).

  Thereafter, the user terminal 1a of the interrogating user determines that the received call forwarding information is accepted as a response to the interrogation information, and establishes voice communication with the user terminal 1b of the answering user (step S216).

[Individual processing operation of each device]
Next, the operation of each device constituting the synchronous question service providing system 100 will be described.

(About processing operation of distribution server 7)
First, the processing operation in the processing unit 73 of the distribution server 7 will be described with reference to FIG.

  First, when the question information and the intermediate network device ID are received from a certain user terminal 1 (step S301), a standby request control signal (100 trying signal) is returned to the user terminal 1 of the question user (step S302).

  Next, a multicast address that is not currently used is acquired (step S303), a user terminal 1 of an answerable user who can answer the received question is determined, and an intermediate network device that accommodates the user terminal 1 3, the forwarding routing information in which the IP address of the user terminal 1 is associated with the multicast address is transmitted, and the routing is set (step S304).

  Thereafter, a call control signal (INVITE signal) is transmitted to the multicast address (step S305), and it is determined whether a response signal (200 OK signal) to the call control signal is received (step S306).

  When the response signal is received in the determination in step S306, since there is a responding user who responded, new forwarding routing information in which the IP address of the user terminal 1b of the responding user is deleted is stored in the user terminal 1b. It is transmitted only to the intermediate network device 3 that is present and routing is set (step S307).

  After step S307, a disconnection control signal (BYE signal) is transmitted to the multicast address, and the call to answerable users other than the answering user who responded first is terminated (step S308). Voice communication is established with (step S309).

  On the other hand, when the response signal is not received in the determination in step S306, the elapsed time after receiving the call control signal is measured, and it is determined whether or not the elapsed time has exceeded the threshold time (step S310). ).

  When the elapsed time exceeds the threshold time in the determination in step S310, it is determined that the answering user is absent, a disconnection control signal is transmitted to the user terminal 1a of the questioning user, and this process is terminated (step S311). On the other hand, if the threshold time has not elapsed, the process returns to step S306.

(About processing operation of the intermediate network device 3)
Next, the processing operation in the processing unit 33 of the intermediate network device 3 will be described with reference to FIG.

  First, it is determined whether the received information (hereinafter referred to as a packet in this process) is user-related information (step S401).

  If it is determined in step S401 that the received packet is user-related information, the IP address of the user terminal 1 that is the transmission source is stored in the service subscriber information storage unit 34 (step S402). The network device ID is added and transmitted to the distribution server 7 (step S403).

  On the other hand, if it is determined in step S401 that the received packet is not user-related information, it is next determined whether or not the received packet is a multicast packet (step S404).

  If the received packet is a multicast packet as determined in step S404, the packet is transmitted to the user terminal 1 based on the transfer routing information already accumulated (step S405).

  On the other hand, if it is determined in step S404 that the received packet is not a multicast packet, it is next determined whether the received packet is forwarding routing information (step S406).

  If it is determined in step S404 that the received packet is forwarding routing information, it is stored in the forwarding routing information accumulating unit 35 (step S407). If it is not forwarding routing information, it is a packet other than this question service. The packet is transferred to the destination (step S408).

(About processing operation of the user terminal 1)
Finally, the processing operation in the processing unit 13 of the user terminal 1 will be described with reference to FIG.

  First, the user related information input by the user is periodically transmitted to the distribution server 7 (step S501). Next, it is determined whether or not the question information is input by the user (step S502).

  If question information is input in the determination in step S502, the question information is transmitted to the distribution server 7 (step S503), and then it is determined whether or not a disconnection control signal has been received from the distribution server 7 (step S503). S504).

  If the disconnection control signal is received within the threshold time in the determination of step S504, this process is terminated. If not received, the call control signal transmitted from the distribution server 7 is determined as a response to the question information, and the answering user's Voice communication is established with the user terminal 1b (step S505).

  On the other hand, if question information is not input in the determination in step S502, it is next determined whether a call control signal has been received from the distribution server 7 (step S506).

  If the call control signal is not received in the determination in step S506, the process returns to step S501. On the other hand, if it has been received, the elapsed time since the call control signal was received is measured, and it is determined whether or not the elapsed time is within a threshold time (step S507).

  If it is determined in step S507 that the elapsed time is not within the threshold time, the disconnection control signal transmitted from the distribution server 7 due to the absence of the answering user is received, and this process is terminated (step S508).

  On the other hand, if it is determined in step S507 that the elapsed time is within the threshold time, it is next determined whether or not a response is received from the user (step S509).

  If a response is received in step S509, it is then determined whether a call control signal has been received (step S510). If received, voice communication is established with the user terminal 1a of the questioning user ( Step S511) If not received, this process is terminated.

  As described above, according to the present embodiment, the distribution server 7 stores the user-related information that each user can know in association with the IP address of each user terminal 1, receives the user's question information, The user terminal 1 of each answerable user who can reply based on the user related information of the user is determined, and a signal addressed to the multicast address is transmitted to the intermediate network device 3 accommodating each determined user terminal 1 to each user terminal Set transfer routing information for transfer, send a call control signal addressed to the multicast address to cause the intermediate network device 3 to make a call to only each determined user terminal 1 and respond to the call Since voice communication is established between the user terminal 1b and the user terminal 1a that transmitted the question information, the convenience of the question service can be improved. That.

  That is, each answerable user who can store user-related information that can be known by each user in association with the IP address of each user terminal 1, accept user's question information, and answer based on the user-related information of each user User terminals 1 are determined, and only the determined user terminals 1 are simultaneously called, and voice communication is established between the user terminal 1b that responds to the call and the user terminal 1a that transmits the question information. A synchronous question service can be provided without knowing the IP address or telephone number of a user who can answer a question. In addition, a user who can answer at the time of an incoming call but is inconvenient does not need to answer the incoming call, and a questioning user can talk only with a user who is convenient.

  In addition, transfer routing information for transferring a signal addressed to the multicast address to the user terminal 1 is set in the intermediate network device 3 that accommodates each determined user terminal 1, and a call control signal is addressed to the multicast address. Since the voice communication is established by making the intermediate network device 3 call only to each determined user terminal 1 at the same time, unicast or broadcast is used when making a call to each answerable user. Therefore, it is possible to provide a synchronous question service while reducing the amount of communication.

  Through these two effects, according to the present embodiment, as a result, the convenience of the question service can be improved.

  Furthermore, according to the present embodiment, since the outgoing call to the unanswered user terminal 1 is canceled, voice communication is established only with the user terminal 1 that responds to the call first, and the one-to-one call Can be realized.

DESCRIPTION OF SYMBOLS 100 ... Synchronous type question service providing system 1 ... User terminal 3 ... Intermediate network device (transfer device)
5 ... router 7 ... distribution server (synchronous question service providing device)
S101-S104, S201-S216, S301-S311, S401-S408, S501-S511 ... step

Claims (5)

Storage means for storing knowledge information that each user can know in association with an identifier of each user terminal;
Determination means for receiving user question information and determining a user terminal of each user who can answer based on the knowledge information of each user acquired from the storage means;
A setting means for setting transfer information for transferring a signal addressed to a multicast address to each user terminal in a transfer device accommodating each determined user terminal;
A call means for transmitting a call control signal to the multicast address, and causing the transfer apparatus to make a simultaneous call only to each of the determined user terminals;
Establishing means for establishing voice communication between the user terminal responding to the call and the user terminal transmitting the question information;
A synchronous question service providing apparatus comprising: The setting means sets the transfer information updated so as not to transfer a signal to the responding user terminal in the transfer device,
The calling means is
The synchronous question service providing apparatus according to claim 1, wherein a disconnection control signal is transmitted to the multicast address, and the forwarding apparatus cancels a call to an unanswered user terminal. By computer
A storage step of storing in the storage means the knowledge information that each user can know in association with the identifier of each user terminal;
A determination step of receiving user question information and determining a user terminal of each user who can answer based on the knowledge information of each user acquired from the storage means;
A setting step for setting transfer information for transferring a signal addressed to a multicast address to each user terminal in a transfer apparatus accommodating each determined user terminal;
Transmitting a call control signal addressed to the multicast address, and causing the transfer apparatus to call only the determined user terminals simultaneously,
Establishing a voice communication between the user terminal that responds to the call and the user terminal that transmitted the question information;
A method for providing a synchronous question service, comprising: The setting step sets the transfer information updated so as not to transfer the signal to the responding user terminal in the transfer device,
The calling step includes
4. The synchronous question service providing method according to claim 3, wherein a disconnection control signal is transmitted to the multicast, and the forwarding apparatus cancels a call to an unanswered user terminal.   5. A synchronous question service providing program that causes a computer to execute the synchronous question service providing method according to claim 3 or 4.

Images