JPH07101899B2 - Comprehensive service Digital network communication terminal equipment - Google Patents

Description

The present invention relates to an ISDN communication terminal device which is connected to an integrated service digital network (hereinafter referred to as ISDN) and is capable of communication in a plurality of communication modes. .

[Conventional technology]

FIG. 5 is a block diagram showing a conventional ISDN communication terminal device shown in, for example, the article "Digital Video Telephone Omnimate 10" published on pages 49 to 54 of the September 1988 issue of "Video Information Industrial". It is a figure.

In the figure, reference numeral 1 is a man-machine including a subscriber number of a partner terminal, a keyboard for inputting communication modes such as communication capability and high-layer compatibility, and a monitor for displaying communication status to a user. It is a control unit. 2 is the subscriber number of the partner terminal input in the man-machine control unit 1,
A call control unit that executes a call procedure according to the ISDN standard based on the communication mode and the like, and 3 executes a call procedure according to the ISDN standard, and communication in the received call setting message. It is an incoming call control unit that confirms whether or not the mode matches the capability of the own terminal. A line control unit 4 includes the call control unit 2 and the call control unit 3 and controls communication according to the ISDN user network interface.

Reference numeral 5 is a number storage unit for storing the subscriber number of the other party called immediately before, and 6 is connected to the man-machine control unit 1, the line control unit 4, and the number storage unit 5 for the ISDN communication. It is a device management unit that manages the operation of the entire terminal device. Reference numeral 7 is an ISDN communication network to which the ISDN communication terminal device configured by these is connected.

Next, the operation will be described. Here, FIG. 6 is a time chart showing a calling sequence of the ISDN communication terminal apparatus configured as described above.

First, in order for the user of this ISDN communication terminal device to make a call to the digital telephone terminal in the videophone mode, after the off-hook, the man-machine control unit 1 of the ISDN communication terminal device gives the subscription to the digital telephone terminal. Enter the person number. At the end of entering the subscriber number, the call control unit 2 issues IS
A message for setting up a call (hereinafter referred to as a SETUP message) in which the content of the transfer capability information element is unrestricted digital is transmitted to the DN communication network 7 in order to talk in the videophone mode. Here, an unrestricted digital videophone mode (for example, 48 kbps for video information,
A highly efficient coding method such as APC-AB or APC-MLQ
Since the transmission method of transmitting and receiving 6 kbps of total 64 kbps data) is adopted, the encoding method of the voice transmitted from this ISDN communication terminal device is APC-AB or AP other than μ-law rule.
It is a highly efficient coding method such as C-MLQ.

The ISDN communication network 7 sends the SETU to the digital telephone according to the called party number information element included in the SETUP message.
P message is transferred and a call setup request is made, but the digital telephone cannot receive and process image information,
Further, since the voice coding system is also different from the μ-law rule which is the telephone mode, it is impossible to make a call in the videophone mode. That is, unrestricted digital communication cannot be performed between the ISDN communication terminal device as a video telephone and the digital telephone. (In this case, the voice communication cannot be performed between the digital telephone and the video telephone.) Therefore, the digital telephone sends a message notifying the completion of channel release and call number release (hereinafter referred to as REL COMP message). It Upon receiving this REL COMP message, the ISDN communication network 7 transmits a message for terminating the call (hereinafter referred to as DISC message) to the ISDN communication terminal device. The user learns that the call has failed and goes on-hook by issuing a busy tone from the speaker or the like in the man-machine control unit 1 of the terminal of the own station. Next, the other party owns a digital telephone, but does not own a terminal having an ISDN communication network connection function capable of mutual communication in the videophone mode, or the subscriber number thereof is set to the ISDN communication network 7. Assuming that the terminal is not the connected terminal but the telephone terminal connected to the existing network, the same party is called again in the telephone mode.

That is, after hooking up, the man-machine control unit 1 of the ISDN communication terminal device inputs a telephone mode (that is, a mode for transmitting audio coded data of the μ-law rule). When the user changes the setting to the telephone mode and gives an instruction to call again, the calling control unit 2 puts the called party number at the time of calling immediately before calling from the number storage unit 5 into the called number information element, and the telephone number is called. In order to communicate in the mode, a SETUP message containing μ-law voice in the transfer capability information element is transmitted to the ISDN communication network 7.

The ISDN communication network 7 sends a ringer tone to the digital telephone according to the called number information element in this SETUP message. When the user of the digital telephone goes off-hook, voice communication is started between the ISDN communication terminal device and the digital telephone.

[Problems to be Solved by the Invention]

Since the conventional ISDN communication terminal device is configured as described above, the call setting with the content of the transmission capability information element being unrestricted digital is rejected and the user rejects the call setting due to the mode setting difference. If the judgment is made, there is a problem that the user must change the content of the communication capability information element to the telephone mode and take a procedure for re-calling, which requires complicated re-operation.

The invention according to claim (1) was made in order to solve the above problems, and when recognizing that the call setup is rejected, the content of the transfer capability information element is automatically set to μ-law.
An object is to obtain an ISDN communication terminal device that changes to the voice mode and executes a procedure for recalling.

The invention according to claim (2) is made to solve the above problems, and there is a communication mode higher than the μ-law voice mode that is matched between the terminals on the transmitting side and the receiving side. In this case, IS that enables communication in that communication mode
The purpose is to obtain a DN communication terminal device.

[Means for Solving the Problems]

The ISDN communication terminal device according to the invention of claim (1) automatically changes the setting of the communication mode to the μ-law voice mode when the call disconnection / release procedure is executed by the partner terminal, and is stored in the number storage unit. A call recall control unit is provided for executing a call recall procedure based on the called subscriber number immediately before the call.

Further, in the ISDN communication terminal device according to the invention of claim (2), when the incoming call control unit has an incoming call setting in a communication mode incapable of communication, the communication mode of the own terminal is set by the user of the transmission message. A function to set the user information element to execute the call disconnection / release procedure is provided, and at the time of executing the call disconnection / release procedure by the partner terminal, the user / user information element of the received message received from the partner terminal is used to send the call from the partner terminal. A communication mode recognition unit that recognizes the communication mode and compares it with the communication mode of the terminal stored in the mode storage unit, a communication mode change unit that changes the communication mode based on the comparison result, and a changed mode. The recalling control section is provided for executing the procedure for recalling call depending on the communication mode and the subscriber number of the partner terminal stored in the number storage section.

[Action]

The ISDN communication terminal device according to the invention of claim (1),
When the call disconnect / release procedure is executed by the remote terminal, the communication mode is automatically changed to the μ-law voice mode, and the call is recalled using the remote subscriber number that was called immediately before and was stored in the number storage section. By implementing the procedure of (1), an ISDN communication terminal device capable of performing communication in the μ-law voice mode without re-operation by the user is realized.

Further, in the ISDN communication terminal device according to the invention as set forth in claim (2), when there is an incoming call setting in a communication mode in which communication is not possible, the incoming call control unit sets the communication mode of the own terminal to the user / user information element of the transmission message. When the call disconnection / release procedure is executed with the other terminal set, and when the call disconnection / release procedure is executed at the partner terminal, the communication mode recognition unit determines from the user / user information element of the received message received from the partner terminal. The communication mode of the partner terminal is recognized, the communication mode of the recognized partner terminal is compared with the communication mode of the own terminal stored in the mode storage unit, and if there is a matching communication mode, the communication mode changing unit Change the communication mode to that communication mode, and execute the recalling procedure in the recalling control section based on the changed communication mode and the subscriber number of the partner terminal stored in the number storage section. By doing so, if there is a higher communication mode than the μ-law voice mode that matches between the sending side and receiving side terminals, the ISDN communication terminal that can perform communication in that communication mode without re-operation by the user Realize the device.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
The figure is a block diagram showing an embodiment of the invention described in claim (1). In the figure, 1 is a man-machine control unit, 2 is a call control unit, 3 is a call control unit, 4 is a line control unit, 5 is a number storage unit, 6 is a device management unit, 7 is an ISDN communication network, Fifth
Since the parts are the same as or equivalent to those of the related art denoted by the same reference numerals in the drawings, detailed description will be omitted.

If the call setup is rejected from ISDN communication network 7,
The communication mode setting is automatically changed to the μ-law voice mode, and the last called subscriber number stored in the number storage unit 5 is read out and the recalling procedure is executed. It is a call control unit.

Next, the operation will be described. Here, FIG. 2 is a time chart showing a calling sequence of the ISDN communication terminal apparatus configured as described above. In FIG. 2, the user of the calling side terminal makes a call to the called side terminal connected to the ISDN communication network 7 in the unrestricted digital mode, and the μ-law is received when the call setting rejection response is received. A call control sequence in the case of automatically changing to the voice mode and re-calling and performing communication in the μ-law voice mode is shown. The calling terminal shown here has a higher communication mode than the called terminal, for example, μ-
Law voice mode, videophone mode, fax mode, etc. are all provided, and the called terminal is a terminal device such as a fax terminal that has μ-law voice mode and fax mode as communication modes. Suppose there is.

As in the conventional case, first, the subscriber of the ISDN communication terminal device is given from the man-machine control unit 1 to the digital telephone after going off-hook in order to make a call to the digital telephone in the videophone mode. Enter the number.
At the end of inputting the number, the calling control unit 2 sends to the ISDN communication network 7 a SETUP message in which the content of the transfer capability information element is unrestricted digital in order to talk in the videophone mode. Since the non-restricted digital videophone mode is set here, the encoding method of the voice transmitted from this ISDN communication terminal device is APC-AB or AP other than the μ-law rule.
Highly efficient coding method such as C-MLQ (for example, for video information
48 kbps, a transmission method for transmitting and receiving a total of 64 kbps of 16 kbps, which is a highly efficient encoding method such as APC-AB or APC-MLQ for voice information).

The ISDN communication network 7 transfers the call setup request to the digital telephone according to the called number information element in the SETUP message, but the digital telephone cannot receive and process the image information, and in the videophone mode. Since it is impossible to make a telephone call, it is not possible to perform unrestricted digital communication. Therefore, the ISDN communication network 7 transmits to the ISDN communication terminal a DISC message to which a reason indicating information element indicating that the call setup is rejected by the existing network is added. When the incoming call control unit 3 of the ISDN communication terminal analyzes the DISC message and recognizes the rejection of the call from the existing network based on the content of the reason display information element, it re-calls in the telephone mode. Change to the μ-law voice mode and put the destination subscriber number read from the number storage unit 5 into the called number information element.
A SETUP message is generated and transmitted to the ISDN communication network 7, and the calling mode change is displayed to the user on the monitor of the man-machine control unit 1.

The ISDN communication network 7 sends a ringer tone to the digital telephone according to the called number information element in the received SETUP message. When the user of the other party's digital telephone responds to this and goes off-hook, communication in the μ-law voice mode is started between the ISDN communication terminal device and the digital telephone.

In the above embodiment, the case where the first call is made in the videophone mode has been described, but any communication mode within the phone mode may be used, and the communication mode should be changed when the call is reissued. Although what is displayed on the monitor of the man-machine control unit is shown, any means can be used as long as it can be understood by the user of the ISDN communication terminal device.

FIG. 3 is a block diagram showing an embodiment of the invention described in claim (2), and the same parts as those in FIG. In FIG. 3, reference numeral 9 denotes a mode storage unit which stores a communication mode such as a communication capability of the self terminal and high layer compatibility, which is input from the man-machine control unit 1.

FIG. 1 shows that 10 has a function of setting the communication mode of its own terminal in the user / user information element of the transmitted message and executing the call disconnection / release procedure when the incoming call is set in the communication mode in which communication is impossible. This is an incoming call control unit different from the incoming call control unit 3 shown. Reference numeral 11 indicates the communication mode of the partner terminal, which is recognized from the user / user information element of the received message received from the partner terminal when the call disconnect / release procedure is executed by the partner terminal. It is a communication mode recognition unit that collates the communication mode of the own terminal stored in the mode storage unit 9.

Reference numeral 12 denotes a communication mode changing unit in the device managing unit 6 for changing the communication mode according to the collation result by the communication mode recognizing unit 11. 13 is a point for executing a recalling procedure based on the communication mode changed by the communication mode changing unit 12 and the subscriber number of the partner terminal stored in the number storage unit 5, This is a recalling control unit different from the recalling control unit 8 shown in the figure.

Next, the operation will be described. Here, FIG. 4 is a time chart showing a calling sequence of the ISDN communication terminal apparatus configured as described above. In FIG. 4, when the call setup negative response is received, the called terminal sets the FAX mode which is the communication mode of the own terminal in the user / user information element of the sent message, and the calling side terminal sets the user / user of the received message. The call control sequence in the case of recognizing the communication mode of the partner terminal from the user information element, changing the communication mode to the FAX mode, and calling again is shown.

First, in order for the user of the calling terminal to make a call in the videophone mode to the called terminal whose communication mode is unknown,
The man-machine control unit 1 inputs the subscriber number given to the called terminal and the videophone mode as the communication mode. The call origination control unit 2 creates a SETUP message in which the contents of the called number information element are the input destination subscriber number and the contents of the transmission capability information element are unrestricted digital, and the SETUP message is set to the ISDN communication network 7. Send a message.

The ISDN communication network 7 sends the SETUP message to the called terminal according to the called number information element in the SETUP message. However, since the called terminal has a different communication mode, it cannot receive and process the image information. In addition, it is not possible, and since communication in the videophone mode is impossible, unrestricted digital communication is not possible. Therefore, the incoming call control unit 10 of the incoming call side terminal transfers the transmission capability, the higher layer compatibility, and the like in the user / user information element to the calling side terminal via the ISDN communication network 7.
R with each information element of lower layer compatibility set to FAX mode
Send an EL COMP message.

The calling control unit 2 of the calling terminal is connected to the ISDN communication network 7.
The DISC message is analyzed by the communication mode recognizing unit 11, and the call setting rejection and the communication mode (FAX mode) of the partner terminal in the user / user information element are recognized and stored in the communication mode and the mode storage unit 9. Check the communication mode of the own terminal. The communication mode recognition unit 11 determines the FA
When it is confirmed that they match in the X mode, the communication mode changing unit 12 is instructed to display the communication mode change of the own terminal, and the communication mode changing unit 12 changes the communication mode of the own terminal to the FAX mode. When the communication mode is changed to the FAX mode, the recalling control unit 13 sets the information elements of the transfer capability, the higher layer compatibility, and the lower layer compatibility to the FAX mode according to the communication mode in the user / user information element. Then, a SETUP message in which the subscriber number of the partner terminal stored in the number storage unit 5 is set in the called number information element is created, and the SETUP message is transmitted to the ISDN communication network 7.

When the ISDN communication network 8 transmits a SETUP message to the called terminal according to the called number information element in the SETUP message, the FAX mode communication is started between the calling and called terminals.

In the above embodiment, the first call is made in the videophone mode, and the called terminal is the fax terminal.
The initial call may be in any communication mode that the calling terminal has, and the called terminal may be any terminal that can connect to the ISDN communication network. The same applies to the setting of the communication mode at the time of rejecting the call setting.
Although a single communication mode is set in the user information element, the called terminal having multiple communication modes may set any number as long as it is within the amount of information according to the user / user information element. The message that sets the user information element may be a call disconnect / release message other than the REL COMP message.

Further, in the above embodiment, when the call setting is rejected, the communication mode changing unit changes the communication mode of the own terminal to automatically call again, but the user uses the man-machine control unit to call again. You may input "Yes / No".

Further, in the above-described embodiment, the case where the communication mode recognition unit and the recall control unit are provided in the call control unit has been described, but each may be provided independently, and the same effect as that of the above-described embodiment is obtained. .

〔The invention's effect〕

As described above, according to the invention described in claim (1), when the call setup is rejected, the communication mode is automatically changed to the μ-law voice mode and the call is reissued. ISD that allows users to communicate in μ-law voice mode without complicated re-operation
There is an effect that the N communication terminal device is obtained.

According to the invention as set forth in claim (2), when the call setup is rejected, the called terminal sets the communication mode of the called terminal in the user / user information element of the transmitted message, and the calling terminal reports the received message. It is configured to recognize the communication mode of the partner terminal from the user / user information element, match it with the communication mode of the own terminal, change to the matching communication mode, and call again. There is an effect that an ISDN communication terminal device capable of performing communication in a higher-level communication mode that matches between a transmission side terminal and a reception side terminal can be obtained without the user performing complicated re-operation.

[Brief description of drawings]

FIG. 1 is an ISDN according to an embodiment of the invention described in claim (1).
FIG. 4 is a block diagram showing a communication terminal device, FIG. 2 is a time chart showing its calling sequence, and FIG. 3 is a block diagram showing an ISDN communication terminal device according to an embodiment of the invention described in claim (2). Is a time chart showing the calling sequence, FIG. 5 is a block diagram showing a conventional ISDN communication terminal device, and FIG. 6 is a time chart showing the calling sequence. 2 is a call control unit, 3 and 10 are call control units, 5 is a number storage unit,
Reference numeral 7 is an ISDN communication network, 8 and 13 are recall control units, 9 is a mode storage unit, 11 is a communication mode recognition unit, and 12 is a communication mode changing unit. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-26170 (JP, A) JP-A-2-174347 (JP, A) JP-A-3-159444 (JP, A)

Claims (2)

[Claims] 1. A call control unit for executing a call procedure to an integrated service digital communication network according to a subscriber number of a partner terminal by designating a predetermined communication mode at the time of call setting, and the communication disabled. When setting up an incoming call in the communication mode, an incoming call control unit that executes a call disconnection / release procedure, a number storage unit that stores the subscriber number of the partner terminal that has called immediately before, and a call disconnection / release by the partner terminal. At the time of execution of the procedure, the communication mode setting is automatically changed to the voice mode by the voice encoding method based on the Mu-Law rule, and the number of the called party called immediately before is stored in the number storage section. And a recalling control unit for executing the procedure for recalling the call, and the integrated service digital network communication terminal device. 2. A mode storage unit for storing communication modes such as a communication capability of the own terminal and high layer compatibility.
An incoming call control unit that executes the call disconnection / release procedure by setting the communication mode of the own terminal in the user / user information element of the transmission message when the incoming call is set in the communication mode in which communication is impossible Sometimes, a call control unit for executing a call procedure to the integrated service digital communication network according to the communication mode and the subscriber number of the partner terminal, and a number storage for storing the subscriber number of the partner terminal called immediately before. And a communication mode of the partner terminal that has been recognized from the user / user information element of the received message received from the partner terminal when the call disconnection / release procedure by the partner terminal is executed. A communication mode recognition unit that collates the communication mode of the own terminal stored in the mode storage unit and a communication mode change based on the collation result of the communication mode recognition unit. A communication mode changing unit, and a recalling control unit that executes a procedure of recalling according to the communication mode changed by the communication mode changing unit and the subscriber number of the partner terminal stored in the number storage unit. Comprehensive service Digital network communication terminal equipment equipped.