JPH05327939A - Video telephone and transmission method therefor - Google Patents

Abstract

PURPOSE:To perform a retransmission by automatically switching to a telephone mode if a returned reason code and a stored reason code coincide with each other when an oscillation is occurred in a video telephone and a communication is not established. CONSTITUTION:When the communication with an other device is not established, reason codes included in a message are extracted. Then, selection table data is referred to and one of the reason codes is read from the reason code group storage area of a ROM 23f which is selected at present and the reason code group additional register area of a RAM 23g. The read reason code and the extracted reason code are compared with each other and whether they coincide or not is decided. Since reason code groups to be retransmitted are stored in the areas of the ROM 23f and the RAM 23g, a video telephone control part 23c controls a network interface control part 23a and performs a retransmission by a voice mode when both the ROM 23f and RAM 23g coincide. When the both of them do not coincide, the operation is repeated till the extracted reason coincides with the code.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a videophone calling method, and more particularly to a videophone mode for communicating voice data and image data (unlimited digital mode) and a telephone mode for communicating only voice data (voice mode). In a videophone equipped with and when making a call in unrestricted digital mode and communication with the partner device is not established, it automatically switches to voice mode according to the reason code returned from the partner device. Videophone that made it possible to redial.

[0002]

2. Description of the Related Art Generally, a videophone has an unrestricted digital mode for communicating voice data and image data and a voice mode for communicating only voice data, and can be connected to both the videophone and the voicephone. You can do it.

To connect with a videophone, for example,
In order to make a call in the unrestricted digital mode by pressing the videophone button and connect to the voice telephone, for example, the phone button is pushed to make a call in the voice mode.

However, if it is not known whether the partner device is a videophone or a voice phone, the call is first made in either mode. For example, the partner device is a videophone and the voice mode is set. In the case of making a call, the videophone button is pressed again after confirming that the partner device is a videophone, and the call is made again in the non-restricted digital mode. Also, if the partner device is a voice telephone and the call is made in the unrestricted digital mode, communication with the partner device is not established, and after the reason code is returned from the partner device or the digital switching network, the call is made again. Pressing the button will redial the call in voice mode.

Therefore, in order to enable smooth mutual communication between a videophone and a voice telephone, Japanese Patent Laid-Open No. 3-2 is used.
The "automatic connection method for videophones" described in Japanese Patent No. 70389 is devised.

[0006] This technique is unconditional, regardless of the reason code returned from the partner device or the digital switching network when the communication with the partner device is not established when the call originates in the unrestricted digital mode. It is to switch to voice mode and redial.

On the other hand, CCITT is a TTC standard JT-H.
320, "5.2.1 Intercommunication with ISDN Phones" and "5.2.2 Intercommunication with PSTN Phones,"
The recommendations are as follows. That is, when making a call from a videophone to an ISDN telephone (digital voice telephone), first make a call in the unrestricted digital mode,
Voice mode when N telephone returns a reason code indicating "attribute mismatch" or when the ISDN telephone returns a reason code indicating "recovery due to timeout" from the digital switching network due to no response. It is recommended to switch to. When making a call from a videophone to a PSTN phone (analog voice telephone), first make a call in the unrestricted digital mode. In this case, a reason code indicating "no partner route" is returned from the digital switching network. Therefore, it is recommended to switch to voice mode.

[0008]

As described above, the TT
According to the C standard, it is recommended that a redial is made when three reason codes indicating "attribute mismatch", "recovery due to timeout", and "no partner route" are returned.

However, when the videophone is connected to the PBX or the leased line network and transmitted to the partner device through the PBX or the leased line network, the reason code returned from the partner device or the digital switching network by the PBX or the leased line network. May be converted to a reason code other than the recommendation, or the reason code other than the recommendation may be generated by the PBX. In that case, there is a problem that the redialing cannot be performed.

In order to deal with reason codes other than recommendations,
Like the method described in Japanese Patent Application Laid-Open No. 3-270389 mentioned above, unconditional redialing can be considered regardless of the reason code, but if redialing with all reason codes is necessary, redialing is necessary. Even if a non-reasonable reason code is returned, the call is redone, so there is a problem that it takes time for the user to receive a connection failure notification after making a call.

Further, since the reason code to be converted or the reason code to be generated differs depending on the type of PBX or leased line network to which the videophone is connected, a method capable of flexibly coping with each connected environment is desired.

An object of the present invention is to allow videophones to have various PB
Even when connected to X or a leased line network, it is possible to redial the call only when a reason code according to the connection environment is returned.

[0013]

In order to achieve the above object, the present invention stores one or more reason codes to be retransmitted in a connection environment in a videophone in advance, and transmits in an unrestricted digital mode. However, when the communication with the partner device is not established, the reason code returned from the partner device or the digital switching network matches one of the reason codes stored in advance. If it does, it automatically switches to voice mode and redials, and if they do not match, it does not redial.

In order to store the reason code to be redialed in the videophone, it is necessary to investigate the reason code to be converted or the reason code to be generated in the connection environment of the videophone.

Therefore, in order to deal with such a case, the present invention automatically determines, when connected to various PBXs or a leased line network, whether or not to retransmit according to the connection environment. You can be able to.

That is, according to the present invention, when a videophone is connected to a certain environment, a call is made in an unrestricted digital mode and communication with the partner device is not established, the partner device or the digital switching network is used. For each of the returned reason codes, the voice mode is unconditionally switched and re-transmitted up to a predetermined number of times, and the number of successful communications established with the partner device by the re-transmission is stored. And
After the predetermined number of times, it is automatically determined whether or not to redial the call, based on the stored number of successes.

When the videophone is newly connected to another environment, it is necessary to clear the number of redials and the number of successes for each reason code.

In addition, it is possible that the reason code returned because the partner device is a voice telephone may overlap with the reason code indicating another reason due to the above conversion or generation. In such a case, As a result of redialing up to a predetermined number of times, all may accidentally fail, so the reason code determined not to redial after the predetermined number of times is 1 per predetermined number of times. The number of times is unconditionally switched to the voice mode and redialed, so that the frequency of redialing is reduced, and the redialing is performed based on the number of successful communications with the partner device established by the redialing. You may make it determine automatically whether to do.

[0019]

When the reason code returned from the partner device or the digital switching network matches any one of the one or more reason codes stored in advance, the voice mode is automatically set. The reason code sent back from the partner device or the digital switching network is converted to a reason code other than recommended by the PBX or leased line network when making a voice call in unrestricted digital mode. Even if the error occurs, or if the PBX generates a reason code other than the recommendation, it is possible to automatically switch to the voice mode and make a redial.

If the reason code returned from the partner device or the digital switching network does not match any one of the one or more reason codes stored in advance, the reason code is re-established. Since the call is not made, the user can be immediately notified of the connection failure.

Further, even when connected to another environment in which the reason code is converted or generated differently, it is possible to deal flexibly by newly storing the reason code to be retransmitted.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing the overall construction of a videophone according to an embodiment of the present invention.

In the figure, 21 is a camera display unit, and 22
Is an image encoding / decoding unit, 23 is a communication control unit, 24 is a handset, 25 is a hook switch, 26 is a key matrix, 27 is a power supply, and 28 is a network signal input / output unit.

The camera display unit 21 is the camera unit 2.
1a and a display unit 21b.

The image code decoding unit 22 is composed of an image code decoding unit 22a and a character / graphic display superposition unit 22b.

The image code decoding unit 22a includes a camera unit 21.
A / D conversion of the image data taken in a and encoding,
The image data output to the signal multiplex distribution circuit unit 23b and the image data output from the signal multiplex distribution circuit unit 23b are decoded and D / A converted, and output to the character / graphic display superposition unit 22b. The character / graphics display superimposing unit 22b superimposes or replaces the character / graphics data (various guidances, etc.) and the image data output from the image code decoding unit 22a, thereby displaying characters / displays on the display unit 21b. The figure is displayed.

The communication control unit 23 is composed of a network interface control unit 23a, a signal multiplex distribution circuit unit 23b, a videophone control unit 23c, and a telephone control unit 23d.

The network interface control unit 23a uses the network signal input / output unit 28 to connect to a partner device via a digital exchange network and communicate image data, voice data, and control data. The signal multiplexing / distributing circuit unit 23b multiplexes image data, voice data, and control data to be transmitted to the partner device and outputs the multiplexed data to the network interface control unit 23a, and the image data, voice data, and control transmitted from the partner device. Separate the data. The videophone control unit 23c includes a microprocessor 23e, a ROM 23f, and a RAM 23g, and controls each component of the videophone. The telephone control unit 23d transmits / receives voice data to / from the handset 24, monitors the hook switch 25 to detect on-hook / off-hook, controls the key matrix 26 to detect key input, and also transmits voice data. Encoding of /
Decrypt.

The power supply 27 includes a camera display unit 21,
Power is supplied to the image code decoding unit 22 and the communication control unit 23.

The videophone of this embodiment has an unrestricted digital mode and a voice mode.
When connected to a BX or a leased line network and transmitted to a partner device through the PBX or the leased line network, the reason code returned from the partner device or the digital switching network is converted to a reason code other than the recommendation by the PBX or the leased line network. If it is done,
In order to deal with the case where a reason code other than the recommendation is generated by the PBX, first, when the call is made in the unrestricted digital mode and the communication with the partner device is not established, the partner device or the digital exchange is performed. According to the reason code returned from the network, it is possible to automatically switch to the voice mode and redial.

For this reason, the videophone of this embodiment stores a reason code group consisting of one or more reason codes to be redialed in the connection environment.

FIG. 3 shows the ROM 2 of the videophone control unit 23c.
It is a figure which shows the redispatch condition table on 3f and RAM23g.

As shown in FIG. 3, the ROM 23f has a PB
A reason code group storage area 31 is provided for storing a reason code group consisting of one or more reason codes that are preliminarily investigated and registered as the reason codes to be retransmitted for each maker / model of X or the leased line network. ing. In addition, RAM23g, PB
One or more reason codes additionally registered by the user as a reason code other than the reason code group stored in the reason code group storage area 31 for each manufacturer or model of X or the leased line network. It has a reason code group additional registration area 32 for storing a reason code group consisting of.

The RAM 23g stores the reason code group storage area 3 corresponding to the maker / model of the PBX or the leased line network to which the videophone is currently connected, which is selected by the user.
1. It has selection table data 33 that stores information indicating the reason code group additional registration area 32.

Therefore, the videophone of this embodiment is based on the reason code group stored in the reason code group storage area 31 and the reason code group additional registration area 32 indicated by the information stored in the selection table data 33. , And the redialing process is performed.

The operation of the videophone of this embodiment will be described below.

First, referring to the flow chart of FIG. 4, an operation of selecting a maker / model of a PBX or a leased line network to which a videophone is currently connected, and a reason code to be redialed are added to a reason code group additional registration area. The operation of additionally registering in 32 will be described.

In FIG. 4, when the user selects the maker / model of the PBX or the leased line network to which the videophone is currently connected, the user operates the key matrix 26 so that the videophone is currently connected. Enter the fact that you want to select the manufacturer / model of the PBX or leased line network you are using.
By operating the model selection process (steps 401 to 403) and additionally registering the reason code to be redialed in the reason code group additional registration area 32, by operating the key matrix 26, the current videophone Enter that the manufacturer / model of the PBX or leased line network to which is connected is selected, and the manufacturer / model selection process (step 40
1 to step 403), after inputting that the reason code to be redistributed is additionally registered in the reason code group additional registration area 32, the reason code additional registration process (step 4)
05 to step 408) is operated.

In the maker / model selection process, the maker / model selection screen is displayed on the display section 21b (step 401). Then, on the manufacturer / model selection screen, the user operates the key matrix 26 to select the manufacturer / model of the PBX or the leased line network (step 402), and the reason code group memory corresponding to the selected manufacturer / model is stored. Area 31, reason code group additional registration area 3
Information indicating 2 is stored in the selection table data 33 (step 403).

FIG. 7 is a diagram showing an example of a maker / model selection screen.

As shown in FIG. 7, the display unit 21b
Includes a title 71 indicating that the manufacturer / model of the PBX or the leased line network is being selected, and a guidance 7 for prompting the user to select the manufacturer / model of the PBX or the leased line network and perform key input.
2 and are displayed. In addition, a reason code group storage area 31 that stores reason code groups that have been investigated and registered in advance
The PBX and the dedicated line network manufacturer / model corresponding to are displayed as a selection branch 73. The user selects the maker / model of the PBX or the leased line network to which the videophone is currently connected by keying in the number assigned to the selection branch 73 from the key matrix 26.

Further, in the reason code additional registration processing, the reason code additional registration screen is displayed on the display section 21b (step 405). Then, on the reason code additional registration screen, when the user operates the key matrix 26 to input the reason code to be redistributed (step 406), the reason corresponding to the maker / model selected in the maker / model selection process. The entered reason code is additionally registered in the code group additional registration area 32 (step 407). Until the end of input processing is detected (step 4
08), the reason code additional registration process is repeated.

FIG. 8 is a diagram showing an example of the reason code additional registration screen.

As shown in FIG. 8, the display section 21b
Includes a title 81 indicating that the reason code is being additionally registered and the maker selected in the maker / model selection process.
The model and the reason code group 82 stored in the reason code group storage area 31 corresponding thereto are displayed. In addition, the reason code 83 that has already been additionally registered by the user
And guidance for urging you to enter the reason code to add 8
4 and are displayed. According to this guidance 84, the user inputs the reason code from the key matrix 26 to additionally register the reason code to be redialed.

As described above, the user selects a reason code group corresponding to the maker / model of the PBX or the leased line network to which the videophone is currently connected, and further redials with a code other than the reason code group. Power reason code groups can be additionally registered.

The maker / model selection process and the reason code additional registration process are performed by the microprocessor 23e in the videophone control unit 23c executing a program stored in the ROM 23f.

Next, the redialing operation of the videophone of this embodiment will be described with reference to the flowchart of FIG.

As shown in FIG. 1, the user first makes an outgoing call operation by off-hooking and dialing the handset 24 (step 100).

When the user makes a call operation, the videophone control unit 23c controls the network interface control unit 23a to make a call in the unrestricted digital mode (step 10).
1).

When the network interface control section 23a receives a message from the partner device or the digital switching network, it outputs this message to the videophone control section 23c, and the videophone control section 23c determines whether this message is a response message. By determining whether or not the communication with the partner device is established (step 102). When communication with the partner device is established, communication is performed in the unrestricted digital mode (step 1).
03).

If the received message is a disconnection message or a release message and communication with the partner device has not been established, the reason code included in the message is extracted (step 104).

Then, referring to the selection table data 33, one reason code is read from the currently selected reason code group storage area 31 and reason code group additional registration area 32 (step 105), and the read reason code is extracted. The reason code thus obtained is compared with the determined reason code to determine whether they match (step 106). Reason code group storage area 3
1. The reason code group additional registration area 32 stores a reason code group to be redeemed. Therefore, if they match, the videophone control unit 23c controls the network interface control unit 23a, Redial in the voice mode (step 107). If they do not match,
It is determined whether all the reason codes have been compared (step 108), and if there is a reason code that has not been compared, the next reason code is retrieved from the reason code group storage area 31 and the reason code group additional registration area 32. The read reason code is compared with the read reason code and the extracted reason code is determined to determine whether they match. The above procedure is repeated until all the reason codes are compared or the extracted reason codes match.

If the reason code does not match the extracted reason code even when compared with all the reason codes, the reason code does not need to be retransmitted. In this case, the process is terminated without retransmitting (step 111).

On the other hand, the network interface controller 23a
When a message is received from the partner device or the digital switching network after redialing in the voice mode, this message is output to the videophone control unit 23c, and the videophone control unit 23c establishes communication with the partner device. It is determined whether or not (step 109). When the communication with the partner device is established, the communication is performed in the voice mode (step 110), and when the communication with the partner device is not established even after redialing, the process ends (step 111). ..

As described above, according to this embodiment, when a voice call is made in the unrestricted digital mode, the PBX is
Even if the reason code returned from the partner device or the digital exchange network is converted to a reason code other than the recommendation by the or private line network, or the reason code other than the recommendation is generated by the PBX, the conversion or If you register the generated reason code, you can automatically switch to voice mode and redial.

Even if the videophone is connected to another PBX or a leased line network and the reason code to be converted or generated changes, it is possible to flexibly register the reason code to be redeemed in the connection environment. Can handle.

In this embodiment, the re-transmitting condition table has a reason code group storage area 31 and a reason code group additional registration area 3 for each maker / model of PBX or leased line network.
Although it has two areas of 2, the reason code group storage area 31 and the reason code group additional registration area 32 may have any one area. When only the reason code group storage area 31 is provided,
It is not necessary for the user to register the reason code to be redialed. When only the reason code group additional registration area 32 is provided, it is not necessary to divide the area for each maker / model of the PBX or the leased line network and select the maker / model by the user.

Further, the reason code to be retransmitted by the user may be selected from the reason codes which have been investigated and registered in advance. In this case, the area is divided according to the manufacturer and model of the PBX or leased line network, and
It is not necessary to select the model.

Next, another embodiment of the present invention will be described.

In the above embodiment, it is necessary to investigate beforehand the reason code group to be retransmitted in the connection environment of the videophone, but in order to investigate the reason code to be retransmitted, the PBX or the dedicated It is necessary to investigate the reason code converted by the line network and the reason code generated by the PBX.

In order to eliminate the need for the above investigation, the videophone of this embodiment unconditionally switches to the voice mode for the first predetermined number of times for each reason code returned from the partner device or the digital switching network, and retransmits. Then, based on the result of the re-transmission, when the reason code is returned, it is determined whether or not to re-transmit. In addition, although it is originally a reason code that should be redialed, in order to relieve that it is judged that it should not be redialed because all of the first predetermined number of redials accidentally failed, it is Even if the reason code is determined not to be used, the call is retransmitted once every predetermined number of times.

Therefore, in the videophone of this embodiment, for each reason code returned from the partner device or the digital switching network, the number of times of re-calling, the number of times the communication with the partner device is established by re-calling, The number of times indicating the frequency of redialing is measured and stored.

FIG. 6 shows the RAM 2 of the videophone control unit 23c.
It is a figure which shows the redispatch result information table 61 on 3g.

As shown in FIG. 6, the re-delivery result information table 61 has a re-delivery number, a re-delivery success number, and a re-delivery success number for each reason code returned from the partner device or the digital switching network.
It has a repeat call frequency counter.

Therefore, the videophone of this embodiment performs the redialing process based on the contents stored in the redialing result information table 61.

The redialing operation of the videophone of this embodiment will be described below with reference to the flowchart of FIG.

As shown in FIG. 5, the user first makes an outgoing call operation by off-hooking the handset 24 and dialing (step 500).

When the user makes a call operation, the videophone control unit 23c controls the network interface control unit 23a to make a call in the unrestricted digital mode (step 50).
1).

When the network interface control section 23a receives a message from the partner device or the digital switching network, it outputs this message to the videophone control section 23c, and the videophone control section 23c determines whether this message is a response message. By determining whether or not the communication with the partner device is established (step 502). When the communication with the partner device is established, the communication is performed in the unrestricted digital mode (step 5).
03).

If the received message is a disconnection message or a release message and communication with the partner device has not been established, the reason code included in the message is extracted (step 504).

Then, the number of times of redialing corresponding to the reason code in the redialing result information table 61 is referred to, and the number of times is 1
It is determined whether or not 0 times or more (step 505). If the number of redials is less than 10, the videophone control unit 23
The c controls the network interface control unit 23a to redial the call in the voice mode (step 510), and adds 1 to the number of redials corresponding to the reason code of the redial result information table 61 (step 515).

Thus, for each reason code, the first 1
Up to 0 times, you can unconditionally switch to the voice mode and redial.

When the network interface control unit 23a receives a message from the partner device or the digital switching network after retransmitting in the voice mode, it outputs this message to the videophone control unit 23c, and the videophone control unit 23c It is determined whether communication with the partner device has been established (step 516). When the communication with the partner device is established, 1 is added to the number of successful re-transmissions corresponding to the reason code in the re-transmission result information table 61 (step 5).
17), communicate in voice mode (step 518),
If the communication with the partner device is not established even after the redialing, the process ends (step 514).

If the number of times of redialing is 10 or more, the reason code has been redialing 10 times or more so far, and the number of times the communication with the partner device is established is redialing. Since it is indicated that the number of times of success is stored, in that case, it is determined whether or not redialing should be performed by determining the number of times of successful redialing (step 50).
6).

That is, if the number of successful redialing is other than 0, it is determined that redialing should be performed because the redialing is successful at least once, and the videophone control unit 23c controls the network interface. The part 23a is controlled to retransmit in the voice mode (step 511).

When the network interface control unit 23a receives a message from the partner device or the digital switching network after transmitting in the voice mode, the network interface control unit 23a outputs this message to the videophone control unit 23c and the videophone control unit 2a.
3c determines whether communication with the partner device has been established (step 512). When the communication with the partner device is established, the communication is performed in the voice mode (step 51).
3) If the communication with the partner device is not established even after the redialing, the process ends (step 514).

If the number of successful re-transmissions is 0,
In order to determine that the redialing should not be performed, the redialing frequency is incremented by 1 in order to reduce the frequency of redialing and the redialing is performed (step 507). The transmission frequency counter is cleared to 0 (step 509), and the transmission is made again in the voice mode (step 510). This makes it possible to determine for each reason code based on the result of the first 10 times of redialing, whether or not redialing should be performed, and also for the reason code that is determined not to redialing, You can unconditionally redial each time.

As described above, according to this embodiment, when a voice call is made in the unrestricted digital mode, the first 10 times are unconditional for each reason code returned from the partner device or the digital switching network. Switch to voice mode and redial, and if the redial is successful even in one of the 10 redials, it has been converted to a reason code other than recommended by the PBX or leased line network, or by the PBX. Even if a reason code other than the recommended one is generated, it is considered that this reason code is the reason code returned to the voice telephone because the call was made in the unrestricted digital mode. Can unconditionally switch to voice mode and redial.

If the redialing is not successful even once out of the 10 times of redialing, it is converted to a reason code other than the recommendation by the PBX or the leased line network, or a reason other than the recommendation is obtained by the PBX. Even if a code is generated, it can be determined that it should not be redialed because it is likely not the reason code that was returned to the voice telephone in the unrestricted digital mode.

Even if it is determined that redialing should not be performed, for example, even if the reason code is a reason code that is returned because the partner device is a voice telephone, this reason code is converted or generated to cause another reason code. In such a case, it is conceivable that all of the first 10 redials will accidentally fail. However, according to the present embodiment, even after the first 10 redials, the redials can be made once every 5 times, so it is possible to discover that the partner device is a voice telephone. ..

As described above, for each reason code returned from the partner device or the digital switching network, whether or not to re-transmit is determined based on whether or not the first 10 re-transmissions are successful. It is not necessary to investigate beforehand the reason code group to be redeemed in the videophone connection environment. Further, it is not necessary for the user to register the reason code to be redistributed.

In this embodiment, the number of times of redialing is unconditionally set to 10 and the number of times of redialing is set to 5; however, it is not limited to this. Further, it may be a predetermined time instead of the number of times. Also, for example, 5
The frequency may be further reduced, such as once, six times, and so on.

Further, in this embodiment, when the videophone is newly connected to another environment, it is necessary to clear the redial result information table 61.

Further, the number indicating the frequency of re-calling may not be fixed, but may be changed so as to be further reduced according to the number of times or a predetermined period.

[0086]

As described above, according to the present invention,
If the reason code returned from the partner device or the digital switching network is converted to a reason code other than the recommendation by storing the reason code to be redialed in advance in the videophone connection environment, or if a reason code other than the recommendation is used. Even if the reason code is generated, the call can be redialed, so even when the videophone is connected to various PBXs or a leased line network, only when the reason code according to the connection environment is returned. The effect is that you can redial.

[Brief description of drawings]

FIG. 1 is a flowchart showing a redialing process according to an embodiment of the present invention.

FIG. 2 is a diagram showing an overall configuration of a videophone according to an embodiment of the present invention.

FIG. 3 is a diagram showing a redialing condition table.

FIG. 4 is a flowchart showing maker / model selection processing and reason code additional registration processing.

FIG. 5 is a flowchart showing a redialing process according to another embodiment of the present invention.

FIG. 6 is a diagram showing a redialing result information table.

FIG. 7 is a diagram showing an example of a manufacturer / model selection screen.

FIG. 8 is a diagram showing an example of a reason code additional registration screen.

[Explanation of symbols]

21 ... Camera display section, 21a ... Camera section, 21
b ... Display unit, 22 ... Image code decoding unit, 22a
... image code decoding unit, 22b ... character / graphic display superimposing unit,
23 ... Communication control unit, 23a ... Network interface control unit,
23b ... Signal multiplex distribution circuit section, 23c ... Videophone control section, 23d ... Telephone control section, 23e ... Microprocessor, 23f ... ROM, 23g ... RAM, 24 ... Handset, 25 ... Hook switch, 26 ... Key matrix, 27 ... Power source, 28 ... Network signal input / output unit, 31 ... Reason code group storage area, 32 ... Reason code group additional registration area, 3
3 ... Selection table data, 61 ... Retransmission result information table.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Higashi 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Information & Communication Division (72) Inventor Shuichi Ishiwata 180 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hiritsu Communication System Co., Ltd.

Claims (11)

[Claims] 1. In a videophone having a videophone mode for communicating voice data and image data and a phone mode for communicating only voice data, a call is made in the videophone mode to establish communication with a partner device. If not, one of the reason code returned from the partner device or the digital switching network and one or more reason codes stored in advance that the call should be redone in the connection environment of the videophone. A method for making a videophone call, which automatically switches to telephone mode and redials when three reason codes match. 2. In a videophone having a videophone mode for communicating voice data and image data and a phonemode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. If not, a storage means for storing one or more predetermined reason codes among a plurality of reason codes that may be returned from the partner device or the digital switching network, and the call in the videophone mode. , Any one of the reason code returned from the partner device or the digital switching network when communication with the partner device is not established, and one or more reason codes stored in the storage means. A videophone, comprising: a calling means for switching to a telephone mode and redialing if the three reason codes match. 3. In a videophone having a videophone mode for communicating voice data and image data and a phone mode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. If not, a storage means for storing any one or more reason codes input from the outside of the plurality of reason codes that may be returned from the partner device or the digital switching network, and a videophone mode. When the communication with the partner device is not established, one of the reason code returned from the partner device or the digital switching network and the reason code stored in the storage means is selected. A videophone, comprising a calling means for switching to a telephone mode and redialing if the reason code matches. 4. In a videophone having a videophone mode for communicating voice data and image data and a phonemode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. If not, a first storage means for storing one or more predetermined reason codes among a plurality of reason codes that may be returned from the partner device or the digital switching network, and a videophone mode. Any one of the multiple reason codes that may be returned from the partner device or the digital switching network when communication with the partner device is not established even if the call is made with the When a call is made in the videophone mode to the second storage unit that stores the above reason code and communication with the partner device is not established, the partner device or the digital communication device is connected. If the reason code returned from the network matches one of the reason codes stored in the first storage means and the second storage means, switch to telephone mode. A videophone, which is provided with a calling means for redialing. 5. In a videophone having a videophone mode for communicating voice data and image data and a phone mode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. Of the reason codes stored in the first storage means, the first storage means for storing a plurality of reason codes that may be returned from the partner device or the digital switching network if not done. When a call is made in the videophone mode and communication is not established with the second storage means for storing the information indicating the reason code designated from the outside, it is returned from the other device or the digital switching network. The reason code that has been generated matches one of the reason codes stored in the first storage means, and the reason code that matches the reason code is Te,
A videophone comprising: a calling means for switching to a telephone mode and redialing if the second storage means stores information indicating that it is designated from the outside. 6. In a videophone having a videophone mode for communicating voice data and image data and a phonemode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. A first code storing one or more reason code group consisting of one or more predetermined reason codes among a plurality of reason codes that may be returned from the partner device or the digital switching network if not done. Of the reason code group stored in the first storage means, second storage means for storing information indicating the reason code group designated from the outside, and transmitting in the videophone mode, When the communication with the partner device is not established, the reason code returned from the partner device or the digital switching network and the reason code stored in the first storage means. If any one of the reason codes of the reason code group in which the information indicating that it is designated from the outside is stored in the second storage means, the mode is switched to the telephone mode and the operation is restarted. A video phone, which is provided with a calling means for making a call. 7. In a videophone having a videophone mode for communicating voice data and image data and a phone mode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. If not performed, a reason code group consisting of one or more predetermined reason codes among a plurality of reason codes that may be returned from the partner device or the digital switching network, and designated externally A first storage means for storing one or more sets of reason code groups consisting of one or more reason codes; and a set of reason code groups stored in the first storage means, which is designated from the outside. When a call is made in the videophone mode and communication is not established with the second storage unit that stores information indicating the set of reason codes, the other device or the digit The reason why the information indicating the designation is stored in the second storage means out of the set of the reason code returned from the exchange network and the reason code group stored in the first storage means A videophone, comprising: a calling means for switching to a telephone mode and redialing if a reason code of any one of a set of code groups matches. 8. The videophone according to claim 6 or 7, wherein the first storage means stores the reason code group for each type of connection environment of the videophone. 9. In a videophone having a videophone mode for communicating voice data and image data and a phone mode for communicating only voice data, a call is made in the videophone mode to establish communication with a partner device. If it does not exist, for each of the multiple reason codes returned from the partner device or the digital switching network, it automatically switches to the telephone mode unconditionally and redials up to a predetermined number of times. After that, based on the number of times the communication with the partner device has been established as a result of the redialing for that number of times, it is determined whether or not to redial the call. A method for making a videophone call, which is characterized by switching to a mode and redialing. 10. In a videophone having a videophone mode for communicating voice data and image data and a telephone mode for communicating only voice data, even if a call is made in the videophone mode, communication with a partner device is established. Otherwise, for each reason code that may be returned from the partner device or the digital switching network, the number of times that the call was switched to the telephone mode and the call was redeemed, and the result of the redialing, the communication with the partner device. The reason code returned from the partner device or the digital switching network when the communication with the partner device is not established even when the call is made in the videophone mode. When the number of redials stored in the storage means exceeds a predetermined number, it is determined whether to redial based on the number of successes. , And when communication is not established with the partner device, the reason code returned from the partner device or the digital switching network is automatically updated up to a predetermined number of times. Switch to phone mode and redial,
After a predetermined number of times, the videophone is provided with a calling means for switching to a telephone mode and redialing only when it is judged by the judging means to redial. 11. The videophone according to claim 10, wherein the determining means determines that the redialing is performed once for each predetermined number of times even if the reason code is determined not to be redialing. Characteristic video phone.