JP2007295191A - Communication terminal, call service system, and call service control program for communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable remaining users to talk with one another when a user utilizing an ISDN communication terminal which performs voice mixing is left out from talking in a state of performing a pseudo four-person call. <P>SOLUTION: It is supposed that a center user B is left out from talking when four-person call among users A to D is performed by allowing ISDN communication terminals of users B and C to perform two groups of pseudo three-person calls by utilizing a mixing function. The communication terminal of the user B notifies the dropout of the user B to the remaining communication terminals of the pseudo three-person call and opens a line. In this case, the communication terminal not performing mixing requests setting of a call to the communication terminal of the user C which performs mixing and starts communication with the communication terminal of the user C to realize a new pseudo three-person call. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a communication terminal capable of making a call in a state where voices of three or more parties are mixed by having a plurality of call channels, a call service system using the communication terminal, and a communication terminal. Responsible for the call service control program, especially when a party withdraws from a call while the voice of three or more parties is mixed and the other party continues the call The present invention relates to a communication terminal, a call service system, and a call service control program for the communication terminal.

  A three-party call service is a service that allows three people to talk simultaneously using their respective telephones.

  FIG. 10 shows a first form of the three-party call service. In the first form shown in FIG. 10, it is assumed that user A has a contract for a three-way calling service. The user A111 calls the user B112, and then the user A111 instructs to hold the call with the user B112. The exchange that has made a three-party call service contract with user A111 puts the call between user A111 and user B112 on hold. In this hold state, the user A111 calls the user C113. The exchange then connects the call between user A111 and user C113. Thereafter, when the user A111 gives an instruction to release the hold, the exchange mixes the voices of two of the three parties and connects the lines with the remaining parties. Thereby, the user A111 can talk to the user B112 and the user C113. Therefore, for example, when the user A111, the user B112, and the user C113 make a consultation for traveling together, it is very convenient. The call charges in this case are all handled by the user A111 who made the call.

  FIG. 11 shows a second form of the three-party call service. In this example, the user B112 calls the user A111. Assume that the user A111 has a contract for a three-way calling service. In this case, the user A111 who picks up the phone places a call with the user B112 on the exchange that has instructed the hold and makes a contract for the three-party call service. In this hold state, the user A111 calls the user C113. When the holding of the call with the user B 112 is subsequently released, the exchange mixes the voices of two of these three parties and connects the lines with the remaining parties. Thereby, the user A111 can talk with both the user B112 and the user C113 by telephone. In this case, the charge for calling the user A111 from the user B112 is handled by the user B112, and the user A111 is responsible for the call made from the user A111 to the user C113.

  However, since such a three-party call service is controlled by the exchange, it is necessary for the user A111 to make a pre-paid contract with the telephone company for the three-party call service. For this reason, it is not possible to receive the three-way calling service without including the subscriber of the three-way calling service. Furthermore, since this service is charged, even if the three parties make an equal call, the service subscribers will be burdened economically.

  In view of this, attention has been paid to the fact that an ISDN (Integrated Services Digital Network) line can make a call for two lines with a single contract line, and a technique that can provide a pseudo three-way call service has been proposed (for example, a patent). Reference 1). This is called a pseudo three-way calling service. In the pseudo three-party call service, a ISDN communication terminal is provided with a mixing function by hardware or software, and it is possible to perform a three-party call independent of the service on the network side.

  FIG. 12 shows a pseudo three-party call service. User B112 uses an ISDN line and can utilize two B channels. Therefore, a call is made with the user A111 using one of the B channels. Thereafter, the user B 112 puts the line on hold and makes a call to the user C 113 using the remaining B channel. The ISDN terminal of the user B 112 has a function of mixing voice data of two lines. Therefore, the ISDN terminal of user B112 releases the line hold and mixes the voice data of each line of user A111 and user C113, so that user A111, user B112, and user C113 perform a pseudo three-way call. It can be carried out. In addition, since the ISDN terminal has a mixing function, it is not necessary to pay the telephone company for a three-way calling service.

  If two sets of the pseudo three-way call as the pseudo three-way call are used, the pseudo four-way call as the pseudo four-way call becomes possible.

  FIG. 13 shows the principle of the pseudo four-way call service. User B112 uses an ISDN terminal, and by using the two B channels, the pseudo three-way calling service shown in FIG. 12 can be performed between user A111 and user C113. The user C113 also uses an ISDN terminal, and the same pseudo three-party call service can be performed between the user B112 and the user D114 by utilizing the two B channels. Therefore, the user B112 and the user C113 mix the three parties' voice data at the respective ISDN terminals, so that the four-party call of the user A111, the user B112, the user C113, and the user D114 can be performed without special control of the exchange. It can be realized in a pseudo manner. At this time, it is not necessary to pay the telephone company for a four-way calling service.

JP-A-2-228153 (third page, upper left column, 16th line to same page, upper right column, 10th line, figure)

  By the way, in this conventional pseudo four-party call, when the user B 112 in FIG. 13 leaves the call, the user A 111 also leaves the call. Similarly, when the user C113 leaves the call, the user D114 also leaves the call. Here, the case where the user B112 leaves the call from the state shown in FIG. 13 and returns to the pseudo three-party call by the remaining user A111, user C113, and user D114 will be specifically shown. Assume that the user C113 and the user D114 are making a call between two parties while the user B112 has left the call.

  (A) In this state, the user A111 makes a call to the telephone of the user C113. User C113 receives a call from user A111. As a result, an incoming tone enters the telephone receiver of the user C113. The incoming tone is a sound that informs that there is an incoming call during a call. This incoming tone is created artificially by the ISDN terminal of the received user C113.

  (B) When the user C113 hears the incoming tone, the call with the user D114 is suspended by holding. And it switches to the call path with the user A111, and confirms that the user A111 wants to perform a pseudo three-way call with the user C113 and the user D114 as before.

  (C) Therefore, as shown in FIG. 14, the user C113 switches the call to the pseudo three-party call mode, and starts the pseudo three-party call by the user A111, the user C113, and the user D114.

  As described above, when the user B 112 or the user C 113 leaves the call during the pseudo four-party call, it is necessary to perform reconnection with a complicated operation in order to return to the pseudo three-party call by the remaining members. . At this time, there is a possibility that there is a person who does not know the telephone number among the three parties. In this case, it is necessary to call the user B112 or the user C113 who missed the call and listen to the telephone number. There was a problem that a new pseudo three-way call could not be formed.

  Therefore, the object of the present invention is to make the remaining when a user who uses a communication terminal that has been mixing audio leaves a call in a state where three or more persons are calling together in a pseudo manner. An object of the present invention is to provide a communication terminal, a call service system, and a call service control program for a communication terminal that allow users to talk with each other.

  (A) a plurality of call channel setting means for setting a plurality of call channels to which one other telephone set as a call partner is connected to the own telephone set as one telephone set arranged on the own apparatus side; (B) telephone number storage means for storing the telephone numbers of the other telephones of the plurality of call channels set by the plurality of call channel setting means; and (c) a plurality of calls set by the plurality of call channel setting means. Mixing means for mixing the voices of the other telephones transmitted through each of the channels as the voices of the other party in common with the own telephone; and (d) the plurality of voice communication channels being transmitted by the mixing means. The call is detected to detect when the call termination procedure of the own phone is started in a state where the call is mixed with the voice of the other phone And (e) when the call end procedure start detection means detects the start of the call end procedure of the own telephone, all the call channels set by the plurality of call channel setting means are Release notification means for notifying the release of the call channel between the other telephone and the own telephone connected to them, and (f) a plurality of call channel setting means when the release notification means notifies the release of the call channel The above-mentioned other telephones which have transmitted at least a part of the telephone numbers of the above-mentioned other telephones stored in the telephone number storage means to each of the plurality of call channels set by the above-mentioned and made a call with this other than the own telephone The communication terminal is provided with reconnection request means for requesting reconnection.

  In other words, in the present invention, a plurality of other telephones are connected to each other by setting a communication channel around a single telephone arranged on the own apparatus side, and the voices of these other telephones are shared by the own telephone. It handles communication terminals that allow multiple parties to talk together by mixing (mixing) the voices of the other party. If one of the telephones arranged on the communication terminal side is disconnected from the call, the voices of the other telephones cannot be mixed. Therefore, it is necessary to reorganize the remaining other telephones so that they can talk with each other. is there. Therefore, the telephone number storage means stores the telephone numbers of these other telephones, detects when the call termination procedure of the own telephone starts, and stores it in the telephone number storage means for each of the plurality of call channels set. At least a part of the stored telephone numbers of the other telephones is transmitted, and the reconnection between the other telephones that have been in communication with the telephone other than the own telephone is requested. Sending at least a part of the telephone number of the other telephone, since it is sufficient that the telephone number necessary for reconnection is given to each other telephone and not all telephone numbers need to be given to each other telephone. I made it.

  Here, the own telephone may be connected to, for example, an ISDN network as one method for setting a plurality of call channels. Other telephones are not necessarily arranged on the communication terminal side for setting a plurality of call channels. However, when a pseudo four-way call is realized using an ISDN line with a B channel of 2 channels, the other telephone connected to the own telephone set on the own apparatus side by the call channel is Similarly, it is necessary to be arranged on the communication terminal side provided with a plurality of call channel setting means and a mixing means for setting a plurality of call channels.

  Further, in the call service system of the present invention, one of the call channels between the communication terminals according to claim 1 is connected by the multiple call channel setting means so that one of the own telephones becomes the other of the other telephones. It is characterized by that.

  In this way, the communication terminals according to claim 1 are connected to each other so that one of their own telephones becomes the other of the other telephone by one of these communication channels, so that, for example, two B channels can be connected to one communication terminal. Is arranged, a pseudo four-party call system that combines two sets of pseudo-pseudo three-party call systems can be configured as a call service system. When the number of call channels is larger than this, it is possible to cope with a situation in which the user leaves during the call in the call service system having a larger scale depending on the connection form.

  Further, in the communication service control program for a communication terminal according to the present invention, the telephone of the communication terminal is connected to (i) another telephone as a telephone serving as a call partner with respect to the own telephone as one telephone arranged on the own apparatus side. A multi-call channel setting process for setting a plurality of call channels to be connected one by one, and (b) a telephone number for storing the telephone numbers of the other telephones of the plurality of call channels set in the multi-call channel setting step, respectively. Storage processing; and (c) mixing processing for mixing the voices of the other telephones transmitted through each of the plurality of call channels set by the plurality of call channel setting means as the common call partner's voice of the own phone; (D) In this mixing process, the voices of the other telephones transmitted through each of the plurality of communication channels are mixed. The call end procedure start detection process for detecting when the call end procedure of the own phone starts in the state of the call, and (e) the call end procedure of the own phone in the call end procedure start detection process When the start is detected, the release notification for notifying the release of the call channel between the other telephone and the own telephone connected to all the call channels set by the multiple call channel setting process described above And the telephone number of the above-mentioned other telephone stored in the telephone number storing process in each of the plurality of call channels set by the multiple call channel setting process when notifying the release of the call channel in this release notification process. Reconnection request processing for requesting reconnection between the above-mentioned other telephones that have transmitted at least a part of the telephone and made a call with the telephone except for the own telephone It is characterized in that to execute.

  In other words, the present invention relates to a call service control program that enables a computer of a communication terminal equipped with its own telephone to make a call by a large number of people in a pseudo manner. Set up multiple call channels to which one other phone as the other party's phone is connected to one's own phone as one phone and set the phone number of the other phone in preparation for reconnection in the phone number storage process Each is stored. Then, the call end procedure start detection process detects when the own telephone call end procedure starts, and the release notification process detects all of the call channels set by the multiple call channel setting process. In addition to notifying the release of the call channel between the above-mentioned other telephones connected to them and the own telephone, the re-connection request processing notifies the telephone number of the above-mentioned other telephones and A reconnection is requested. The other telephones described above perform reconnection for a two-party call or multi-party call based on the notified telephone numbers.

  As described above, according to the present invention, when the telephone set as the telephone on the communication terminal side, which has been the core of the call by many people, leaves the call, Since the telephone number necessary for reconnection is notified to the other telephones and the call channel with the own telephone is decided to be released, the other telephones can reconnect without user intervention. Therefore, even when a pseudo three-party call or a pseudo multi-party call is connected and many people are participating in the call, telephones using the telephone numbers of other telephones stored in advance are not connected. A speech path can be easily formed. Further, since the other telephones are reconnected without using the user, erroneous connection due to human error can be prevented.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows an ISDN communication terminal of user A connected to the ISDN network and a telephone connected to the ISDN communication terminal. ISDN communication terminal 201A of user A111 (FIG. 13) is connected to ISDN network 203 via ISDN line 202A. The ISDN communication terminal 201A of the user A111 is connected to the ISDN communication unit 205 connected to the ISDN line 202A and the B channel 206 as two communication data transmission paths of the ISDN communication unit 205, and selectively mixes. A selection switch mixing unit 207 to perform, a telephone control unit 209 connected to the selection switch mixing unit 207 to control the telephone 208A of the user A111, and a ISDN communication as a data transmission path for providing a control signal for communication and an additional function The control unit 212 is connected to the D channel 211 provided in the unit 205 and controls the selection switch mixing unit 207 and the telephone control unit 209.

  The ISDN communication unit 205 controls ISDN protocol layer 1 and protocol layer 2 and performs transmission / reception of the B channel with the selection switch mixing unit 207. In addition, the ISDN communication unit 205 transmits and receives D channel data to and from the control unit 212. The selection switch mixing unit 207 mixes either the B1 channel or the B2 channel constituting the B channel with the voice data of another user, or the voice data of the B1 channel and the B2 channel, that is, the user A111 and the user B112 (FIG. 13). After the voice data is mixed, transmission / reception with the ISDN communication unit 205 and the telephone control unit 209 is performed.

  The telephone control unit 209 is connected to the telephone 208A of the user A111, converts the audio data output from the selection switch mixing unit 207 into digital / analog, and converts the analog audio signal output from the telephone 208A into a digital signal. It is designed to convert to data. The telephone control unit 209 also controls the telephone such as ringing (sound).

  On the other hand, the control unit 212 includes a user / user information transmission unit 214, a user / user information reception unit 215, and a transmission / reception control unit 216 connected to the user / user information transmission unit 214 and the user / user information reception unit 215. And an outgoing / incoming call setting storage unit 217 connected to the outgoing / incoming call control unit 216. Here, the outgoing / incoming control unit 216 manages the ISDN layer 3 protocol, and sends / receives control signals to / from other ISDN communication terminals based on user / user information. It is designed to control the transition to pseudo three-party calling. The user / user information transmission unit 214 transmits user / user information, and the user / user information reception unit 215 receives user / user information. The outgoing / incoming call setting storage unit 217 sets whether or not to shift from a pseudo four-party call to a pseudo three-party call, and stores a reconnection destination telephone number when shifting to a pseudo three-party call. ing. The functional configuration of the outgoing / incoming control unit 216 will be described in more detail later with reference to FIG.

  Although not shown, the control unit 212 stores a CPU (Central Processing Unit), a ROM (Read Only Memory) storing a control program executed by the CPU, a RAM (Random Access Memory) as a working memory, and the like. It has a medium. All or a part of each part constituting the control part 212 is realized by software instead of hardware by executing a control program. All or part of the ISDN communication unit 205, selection switch mixing unit 207, and telephone control unit 209 are also replaced with software by the same CPU as the above-described CPU or a different CPU and control program (not shown). Realized.

  In this embodiment, it is assumed that a pseudo four-way call is performed between the users shown in FIG. In this embodiment, the ISDN communication terminals 201B, 201C, and 201D of the user B112, the user C113, and the user D114 shown in FIG. 13 are respectively connected via the ISDN lines 202B, 202C, and 202D to simplify the description. It is assumed that it is connected to the ISDN network 203. Therefore, illustration and description of ISDN communication terminals 201B, 201C, and 201D and telephones 208B, 208C, and 208D connected to these users B112, C113, and D114 are omitted.

  The pseudo four-party call described in this embodiment uses two sets of pseudo three-party calls. In this sense, user B 112 and user C 113 shown in FIG. 13 use ISDN communication terminals 201B and 201C. is required. For the user A111, the ISDN D channel control is used until the line is disconnected and then reconnected. For this reason, the user A111 also needs to use the ISDN communication terminal 201A. The remaining user D114 may use a communication terminal of another line.

  FIG. 2 shows the configuration of the ISDN communication terminal of user A that embodies the outgoing / incoming call control unit shown in FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. The outgoing / incoming control unit 216 includes a user / user information conversion unit 221, a user / user information analysis unit 222, and a outgoing / incoming setting confirmation / outgoing / incoming telephone number transmission unit 223. Among these, the user / user information conversion unit 221 converts the control data 225 transmitted from the outgoing / incoming call setting confirmation / calling / incoming telephone number transmission unit 223 according to the protocol of the user / user information, and converts the converted user / user information 226. Is transmitted to the user / user information transmission unit 214.

The outgoing / incoming call setting confirmation / calling / calling telephone number transmission unit 223 performs the following in order to enable transition from a pseudo four-party call as two sets of pseudo three-party calls to a set of pseudo three-party calls in this embodiment. It has each function.
(A) When sending a disconnect message at the end of a pseudo three-party call, a reconnection request for continuing communication, mutual telephone number information of connection destinations, and instruction information on the calling side and called side are used as control data 225 for the user / user. A first function to be transmitted to the information conversion unit 221.
(B) A second function for placing a reconnection request in the user / user information when calling for reconnection.
(C) A third function for confirming whether or not there is a reconnection request flag in the user / user information of the outgoing call message when an incoming call is received.
(D) It is confirmed whether or not the telephone number information 227 indicating the telephone number stored in the outgoing / incoming call setting storage unit 217 matches the outgoing call number. A fourth function for placing connection permission information in user information and starting mixing at the start of communication.

  Next, a sequence for shifting from a pseudo four-party call to a pseudo three-party call will be described. In the connection state shown in FIG. 13, user B112 is communicating with user A111 and user C113, and user C113 is communicating with user B112 and user D114. The pseudo three-party call is in progress by executing both the pseudo three-party call functions of the user B 112 and the user C 113. At this time, it is assumed that the user B 112 leaves the call.

  FIG. 3 shows the state of control when the ISDN communication terminal terminates the pseudo three-party call. When ISDN communication terminal 201B exits from the call and user B112 puts a handset (not shown) on telephone 208B and goes on-hook for the end of the call (step S301: Y), the above-described CPU performs mixing during the pseudo three-party call. It is determined whether it is a call end instruction for a call (step S302). Otherwise (N), normal call termination processing is performed (step S303).

  On the other hand, if it is a call end instruction for a call that was being mixed during a pseudo three-way call (step S302: Y), the reconnection request and the mutual telephone number information of the connection destination and the caller side instruction The information is referred to as “reconnection information”, and the ISDN communication terminal 201 that has performed mixing of the two ISDN communication terminals 201A and 201C that have been connected to the present is used as the user / user information of the disconnect message. Then, it is transmitted (step S304). In this example, the ISDN communication terminal 201C corresponds to this. Therefore, the ISDN communication terminal 201B transmits the ISDN communication terminal 201C with reconnection information added to the disconnect message.

  FIG. 4 shows the flow of processing of the ISDN communication terminal when reconnection information is sent. In the above example, the processing is performed in the ISDN communication terminal 201C. The CPU of the ISDN communication terminal 201C waits for the reconnection information to be sent in the disconnect message (step S321). When the reconnection information is sent in the disconnect message (Y), the terminal determines whether or not the voice data is being mixed (step S322). ISDN communication terminal 201C is mixing audio data of ISDN communication terminal 201B and ISDN communication terminal 201D (Y). Therefore, the line is opened with the ISDN network 203 shown in FIG. 1 (step S323), and the process is terminated.

  Returning to FIG. 3, the continuation of the processing of the ISDN communication terminal 201B will be described. When ISDN communication terminal 201B transmits control data in the form of reconnection information included in the disconnect message to ISDN communication terminal 201C (step S304), ISDN network 203 notifies ISDN communication terminal 201C that it has been released. Wait (step S305). If this notification is received (Y), the ISDN communication terminal 201B notifies the ISDN network 203 of the completion of opening of the communication path with the ISDN communication terminal 201C (step S306). Then, control data is transmitted to the ISDN communication terminal 201A connected to the other B channel in a form in which the reconnection information is included in the disconnection message as in step S304 (step S307).

  Thereafter, the ISDN communication terminal 201B waits for a notification that the ISDN communication terminal 201A has been released from the ISDN network 203 (step S308). If this notification is received (Y), the ISDN communication terminal 201B notifies the ISDN network 203 of the completion of opening of the communication path with the ISDN communication terminal 201A (step S309). As described above, the ISDN communication terminal 201B ends the process for exiting the call (end).

  Returning again to FIG. 4, the processing of the ISDN communication terminal whose communication path is to be released will now be described by taking the ISDN communication terminal 201A as an example. When ISDN communication terminal 201A receives the information in which the reconnection information is included in the disconnection message from ISDN communication terminal 201B that leaves the call (step S321: Y), the self terminal is a communication terminal that performs mixing by pseudo three-way communication. It is determined whether or not there is (step S322). The ISDN communication terminal 201A does not perform this role (N). Therefore, the ISDN communication terminal 201A first opens a line with the ISDN network 203 shown in FIG. 1 (step S324).

  Next, the ISDN communication terminal 201A becomes a new connection target in a form in which a reconnection request is placed in the call setting message based on the telephone number of the ISDN communication terminal that is the connection destination found from the reconnection information. Is transmitted to the ISDN communication terminal 201C (step S325). When the ISDN communication terminal 201A receives a call from the ISDN communication terminal 201C, the ISDN communication terminal 201A responds to the call (step S326), sets a call between the two, and starts a call (step S327).

  Finally, in FIG. 4, when ISDN communication terminal 201A is still talking to ISDN communication terminal 201D and ISDN communication terminal 201C sends a reconnection request to the call setup message in the form of a reconnection request. Will be explained. When the ISDN communication terminal 201C receives the information in which the reconnection request is included in the call setting message (step S328: Y), the ISDN communication terminal 201A is called and receives a response from the ISDN communication terminal 201A (step S329). . Then, in the current state where the selection switch mixing unit 207 performs mixing, a call is started with the ISDN communication terminal 201A (step S330). At this time, since ISDN communication terminal 201C is in a call with ISDN communication terminal 201D, a new three-way call with ISDN communication terminal 201A is added to start a pseudo three-party call.

  FIG. 5 shows a process for switching from the pseudo four-party call described above to the pseudo three-party call based on a specific example. This will be described with reference to FIGS. 13 and 1.

First, at time t ₁ , user A 111 and user B 112, user B 112 and user C 113, and user C 113 and user D 114 are connected via the ISDN network 203. In this state, the mixing function of the selection switch mixing unit 207 of the ISDN communication terminal 201B and the ISDN communication terminal 201C is turned on for the two B channels, and a pseudo four-party call is possible by these pseudo three-party calls functions. It has become.

When the user B 112 goes off-hook at time t ₂ , the ISDN communication terminal 201 B carries reconnection information in the disconnect message in the user / user information, is sent to the ISDN network 203, and is sent to the ISDN communication terminal 201 C of the user C 113. The ISDN communication terminal 201C stores the telephone number of the reconnection partner in the outgoing / incoming call setting storage unit 217 based on the reconnection information sent at this time, and opens the line. When the ISDN network 203 notifies the line opening, the ISDN communication terminal 201B completes the line opening with the ISDN communication terminal 201C.

And reconnection information is placed on the next time t ₃ from the ISDN communication terminal 201B to the disconnect message to the user-user information sent to the ISDN network 203, it is sent to the ISDN communication terminal 201A of the user A111. The ISDN communication terminal 201A stores the telephone number of the reconnection partner in the outgoing / incoming call setting storage unit 217 based on the reconnection information sent at this time, and opens the line. When the release of the line is notified from the ISDN network 203, the ISDN communication terminal 201B completes the line release with the ISDN communication terminal 201A.

Once this way ISDN communication terminal 201B and is disconnected from the ISDN communication terminal 201C and ISDN communication terminals 201A, reconnection request is loaded from the ISDN communication terminal 201A of the user A111 the call setting message to the user-user information in time t ₄ Are sent to the ISDN network 203 and sent to the ISDN communication terminal 201C of the new connection destination user C113. When the ISDN communication terminal 201 </ b> C confirms that the reconnection request flag exists, the ISDN communication terminal 201 </ b> C reads the telephone number stored in the outgoing / incoming call setting storage unit 217 and sends a call signal to the ISDN network 203.

When the further response sent from the user C113 user A111 side, the call from the time t ₅ between the user A111 and user C113 are started. The ISDN communication terminal 201C communicates with the ISDN communication terminal 201D, and the pseudo three-party call is performed among the user A111, the user C113, and the user D114 by the pseudo three-party call function by mixing of the ISDN communication terminal 201C. It will be.

  FIG. 6 shows a state in which user B leaves the call from the pseudo four-party call described above. The same parts as those in FIG. 13 are denoted by the same reference numerals. User B112 was mixing audio between user A111 and user C113 in a state before leaving the call. Therefore, the user / user information of the disconnection message to the user A111 and the user C113 is transmitted with a message indicating that the telephone number of these users and the conversation between these users are continued. At this time, the user C113 is mixing audio between the user B112 and the user D114.

  FIG. 7 shows the state of the pseudo three-party call after the transition from the pseudo four-party call. User A111 calls user C113 from the telephone number of the user / user information. The user C113 confirms the coincidence between the telephone number and the called number in the user / user information, and a new call is connected between them. The user C113 shifts to a pseudo three-party call by mixing not only the user D114 but also the user A111.

  <Modification of the invention>

  In the embodiment described above, when a user who is performing audio mixing in a pseudo three-way call during a pseudo four-party call leaves the call, two users who should newly set up a call are notified by the user who leaves the call. I decided to notify the phone number of the connection destination. In the modified example of the present invention, during the pseudo four-party call, notification of the telephone number of the connection destination is made to each of the four parties using the user information. In this case, each ISDN communication terminal 201A to 201D stores the telephone numbers of the three telephones 208 connected to other than the terminal itself in the outgoing / incoming call setting storage unit 217 shown in FIG.

  8 and 9 show the flow of processing of each user in this modification. 6 and 1, reconnection when the user B 112 and the user C 113 are disconnected from the call at a timing that can be regarded as simultaneous in time will be described. For example, this is the case when the user B 112 and the user C 113 leave the conversation at the same time due to a meeting or a visitor.

At time t ₁₁ is first shown in FIG. 8, the user A111 and user B112, user B112 user C113, and user C113 and the user D114 is connected via the ISDN network 203, respectively. In this state, both of the mixing functions of the selection switch mixing unit 207 of the ISDN communication terminal 201B and the ISDN communication terminal 201C are turned on for the two B channels. It is possible.

At time t ₁₂ , the ISDN communication terminal 201 B of the user B 112 transmits the telephone number of the user A 111 that is communicating on the same ISDN line 202 as the connection destination telephone number as user information. Receiving this, the ISDN communication terminal 201C of the user C113 adds the telephone number of the user A111 to the telephone numbers of the user B112 and the user D114 in communication, and stores the other party of the pseudo four-way call in his / her outgoing / incoming call setting storage unit 217. Store as. Then, the ISDN communication terminal 201C adds the telephone number of the communication partner user B112 that has been sent to the telephone number of the user A111, and transmits it as the connection destination telephone number in the user information. Upon receiving this, the ISDN communication terminal 201D of the user D114 sets the telephone number of the user A111 and the user B112 as the connection destination telephone numbers sent to the telephone number of the user C113 in communication, and the own outgoing / incoming call setting storage unit 217. Stored as the partner of the pseudo four-way call.

ISDN communication terminal 201C user C113 is the time t _13, and transmits the user information to the user's phone number D114 for communicating the same ISDN line 202 as the destination telephone number. Receiving this, the ISDN communication terminal 201B of the user B112 adds the telephone number of the user D114 to the telephone numbers of the user A111 and the user C113 in communication and stores the other party of the pseudo four-way call in his / her outgoing / incoming call setting storage unit 217. Store as. Then, the ISDN communication terminal 201C adds the telephone number of the user D114 of the communication partner that has been sent to the telephone number of the user C113, and transmits it as the connection destination telephone number as user information. Upon receiving this, the ISDN communication terminal 201A of the user A111 sets the telephone number of the user C113 and the user D114 as the connection destination telephone numbers sent to the telephone number of the user B112 in communication, and the own outgoing / incoming call setting storage unit 217. Stored as the partner of the pseudo four-way call.

  In this way, in the outgoing / incoming call setting storage unit 217 of the ISDN communication terminals 201A to 201D of the user A111, the user B112, the user C113, and the user D114, the telephone numbers of the three parties other than the self who are making the pseudo four-party call Each is stored as a connection destination telephone number.

In this state, the time t _14, for example, the user B112 was on-hook to exit the call. Then, the reconnection information is added to the disconnection message and transmitted from the ISDN communication terminal 201B to the user C113 side as one counterpart of the disconnection. The ISDN communication terminal 201C113 receives this and opens the line with the user B112. The ISDN communication terminal 201B that has received the notification that the line has been released from the ISDN network 203 notifies the completion of the line opening with the ISDN communication terminal 201C.

At time t ₁₅ shown in FIG. 9 after just from the time t ₁₄ shown in FIG. 8, the user A111 side as the other party from the ISDN communication terminal 201B, re-connection information is transmitted by being added to the disconnect message The The ISDN communication terminal 201A111 receives this and opens the line with the user B112. The ISDN communication terminal 201B that has received the notification that the line has been released from the ISDN network 203 notifies the completion of the line opening with the ISDN communication terminal 201C.

Assume that when the user B 112 is notified that he / she is out of the call, the user C 113 also leaves the call in a corresponding manner, and the user C 113 is also on-hook following the on-hook of the user B 112. At the time t ₁₆ , the reconnection information is added to the disconnect message and transmitted from the ISDN communication terminal 201 C to the currently connected user D 114. The ISDN communication terminal 201D receives this and opens the line. The ISDN communication terminal 201C that has received the notification that the line has been released from the ISDN network 203 notifies the ISDN network 203 that the line has been opened with the ISDN communication terminal 201D.

At subsequent time t ₁₇ , ISDN communication terminal 201 C transmits user information for changing the connection destination to one of the users who have not left the call to ISDN communication terminal 201 A via ISDN network 203. . The ISDN communication terminal 201A specifies the remaining users D114 excluding the user B112 and the user C113 who have dropped out of the call from the parties of the pseudo four-party call stored in the own outgoing / incoming call setting storage unit 217. Then, the user D 114 is transmitted at time t ₁₈ with the reconnection request added to the disconnection message via the ISDN network 203.

Upon receiving this transmission, the ISDN communication terminal 201D confirms that there is a reconnection request from one of the parties of the pseudo four-way call stored in its own outgoing / incoming call setting storage unit 217, and the ISDN network A call is made to the user A 111 via the ISDN network 203 via 203. When the further response sent from the user D114 user A111 side, the remaining two users 113, so that the call from the time t ₁₉ between the user 114 is initiated. In the case of this example, a normal call by two parties, user A111 and user D114, is started from a four-party pseudo call.

  In the embodiment and the modification described above, the case where the B channel uses two ISDN lines has been described. However, the number of the B channel may be three or more. In this case, a larger number of users than the pseudo four-party call in the embodiment and the modified example can make a call together using the mixing function.

  Furthermore, the present invention is also applied to a case where a plurality of telephones that are making a call with a communication terminal having three or more B channels continue the call when the telephone of the communication terminal leaves the call. Of course.

  Further, the present invention is applied to a communication terminal having a plurality of call channels or a call service system having the call channels and a call service control program for the communication terminals, and the call channels need to be provided by the ISDN network. Of course, it does not necessarily exist.

It is a block diagram showing the ISDN communication terminal of user A connected to the ISDN network and a telephone connected to the ISDN network in this embodiment. It is a block diagram of the ISDN communication terminal which actualized the transmission / reception control part in a present Example. It is a flowchart showing the mode of control when an ISDN communication terminal ends a pseudo three-party call in the present embodiment. It is a flowchart of a process of the ISDN communication terminal when reconnection information is sent in the present embodiment. It is the timing figure which represented the process which switches from a pseudo four-party call to a pseudo three-party call in a present Example based on a specific example. It is explanatory drawing showing the state from which a user B leaves a call from a pseudo four-way call in a present Example. It is explanatory drawing showing the state of the pseudo three-way call after transfer from a pseudo four-way call in a present Example. It is a timing diagram showing the first half of the process which transfers to a two-party call from a pseudo four-party call in a modification of the present invention. It is a timing diagram showing the second half of the process which transfers to a two-party call from a pseudo four-party call in this modification. It is explanatory drawing which showed the 1st form of the three-party call service. It is explanatory drawing which showed the 2nd form of the three-party call service. It is explanatory drawing showing the structure of the pseudo three-way call service. It is explanatory drawing showing the structure of the pseudo four-way call service. It is explanatory drawing showing the pseudo | simulation three-party call mode structure.

Explanation of symbols

111 User A
112 User B
113 User C
114 User D
DESCRIPTION OF SYMBOLS 201 ISDN communication terminal 202 ISDN line 203 ISDN network 205 ISDN communication part 207 Selection switch mixing part 208 Telephone 212 Control part 216 Incoming / outgoing call control part 217 Incoming / outgoing call setting confirmation / outgoing / incoming telephone number transmission part

Claims (8)

A plurality of call channel setting means for setting a plurality of call channels to which one other telephone set as a call partner is connected to the own telephone set as one telephone set arranged on the own device side;
Telephone number storage means for storing the telephone numbers of the other telephones of the plurality of call channels set by the plurality of call channel setting means;
Mixing means for mixing the voice of the other telephone transmitted through each of the plurality of call channels set by the plurality of call channels setting means as the voice of a common call partner of the own telephone;
The end of the call is detected when the call termination procedure of the own telephone is started in a state where the mixing unit performs a call by mixing the voices of the other telephones transmitted through the plurality of call channels. Procedure start detection means,
When the call end procedure start detecting means detects the start of the call end procedure of the telephone, the other telephone connected to all the call channels set by the plurality of call channel setting means An opening notification means for notifying the opening of a call channel with the telephone;
When the release notification means notifies the release of the call channel, at least a part of the telephone number of the other telephone stored in the telephone number storage means for each of the call channels set by the plurality of call channel setting means. A communication terminal comprising: a reconnection request means for requesting reconnection between the other telephones that have been sent and made a call with the telephone except for the own telephone.   2. The communication terminal according to claim 1, wherein the own telephone is connected to an ISDN network together with at least a part of the other telephone.   2. The call service system according to claim 1, wherein one of the call channels between the communication terminals is connected by the plurality of call channel setting means such that one of the own telephones becomes the other of the other telephones.   4. The call service system according to claim 3, wherein the call channel is an ISDN B channel.   Two B channels are prepared for one communication terminal, whereby a set of three communication terminals each performing a pseudo three-party call shares one call channel, 5. The call service system according to claim 4, wherein when the release notification means notifies the release of the call channel, the four telephones make a voice call together.   Three or more B channels are prepared in one communication terminal, whereby at least one set of communication terminals performing a pseudo multi-party call shares the call channel with each other, so that the release notification means 5. The call service system according to claim 4, wherein a number of telephones that are equal to or greater than the number of telephones constituting a set of one communication terminal make a voice call together at the time of notifying the release of the call channel. In the computer of the communication terminal,
A multi-call channel setting process for setting a plurality of call channels to which one other telephone set as a call partner is connected to the own telephone set as one telephone set disposed on the own apparatus side;
A telephone number storing process for storing the telephone numbers of the other telephones of the plurality of call channels set in the multiple call channel setting step;
Mixing processing for mixing the voice of the other telephone transmitted through each of the plurality of telephone channels set by the plurality of voice channel setting means as the voice of the other party common to the telephone;
In this mixing process, the voice of the other telephone transmitted through each of the plurality of telephone channels is mixed, and the telephone call is detected when the call termination procedure of the own telephone starts. Procedure start detection process,
When the call end procedure start detection process detects the start of the call end procedure of the own telephone, the other telephones connected to all of the call channels set by the plurality of call channel setting processes An opening notification process for notifying the opening of a call channel with the telephone,
When notifying the release of the call channel in the release notification process, at least a part of the telephone number of the other telephone stored in the telephone number storage process is stored in each of the call channels set in the multiple call channel setting process. A communication service control program for a communication terminal, characterized by executing reconnection request processing for requesting reconnection between the other telephones that have been transmitted and made a call with the telephone except for the own telephone.   The communication channel of the communication terminal is two channels, and the multi-call channel setting process includes a process of forming a common channel with one of the call channels of other communication terminals that perform the same call service. A communication service control program for a communication terminal according to claim 7.

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