JP2783661B2 - ISDN communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention includes an ISDN (Digital Integrated Services Network) having an ISDN interface unit having a communication processing function.
It relates to an ISDN communication device.

[Conventional technology]

The ISDN communication device can use two channels simultaneously on the interface of the interface unit. That is, a plurality of channels can be used simultaneously by one line.

So while calling the same person on one channel,
It is possible to perform multimedia communication such as a video phone, such as sending an image on another channel. In a conventional ISDN communication device, when performing a multimedia communication such as a videophone, it is likely that the first device communicates by voice with a partner device connected by the first channel transmission and sends images to each other. After such a consultation, the transmission of the second channel for image transmission was performed artificially.

[Problems to be solved by the invention]

As described above, in the ISDN communication device, it is cumbersome to first transmit the first channel and then secondly transmit the second channel. In order to transmit two channels, in the conventional ISDN device, if the partner device is a terminal device connected to a general analog network and only one channel can be used on one line, the first device is used. Even if a connection can be made with a partner device with one channel, a connection with the next channel cannot be made, so a connection with the first channel is also invalidated. There was a problem that it would be possible to do it only with voice calls, but it could not.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art. If the partner device is still an ISDN communication device, transmission is performed for two channels from the beginning and two channels for multimedia communication are transmitted. To provide an ISDN communication device having a means for automatically enabling one-channel connection if the communication device can be connected and the other device can use only one channel connected to a general analog network. is there.

[Means for solving the problem]

In order to achieve the above object, in the present invention, an ISDN communication device having an ISDN interface unit having a communication processing function for ISDN is provided with processing means for a signal message notified from the ISDN side.

[Action]

When one of the two channels available on the interface of the ISDN interface unit is used in a call mode and a call is transmitted to the partner device via the ISDN, the message processing means uses a signal message notified from the ISDN side. , Determine the type of network to which the other device is connected,
When it is ISDN, the remaining one channel is automatically transmitted in the digital communication mode. When it is a network other than ISDN, the remaining one channel is not transmitted and the one channel in the communication mode is maintained. I do.

In this way, if the other device is an ISDN communication device,
Two channels can be connected for multimedia communication by transmitting two channels from the beginning. If the partner device is a communication device connected to a general analog network, the connection on one channel is automatically performed. It can be carried out.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a system configuration diagram showing an example of a communication network including an ISDN communication device according to the present invention.

In the figure, 10A and 10B are video telephones, respectively,
Connected to SDN20. The videophone 10A includes an ISDN communication device 1A, an imaging device 2A such as a TV camera, a video display 3
A, codec (video codec) 4A. The ISDN communication device 1A has two available channels,
The communication in the communication mode by voice is performed using one channel, and the communication in the image mode is performed using the remaining one channel. In the image mode communication, the face and appearance of the caller are imaged by the imaging device 2A, and the image signal is video-encoded by the codec 4A and sent to the ISDN communication device 1A.
This is performed by decoding the video code received from the other device from the partner device by the codec 4A and displaying the decoded video code on the video display 3A.
The same applies to the videophone 10B side.

The videophone 10A is a videophone 10B via the ISDN20.
In some cases, the communication may be with an ordinary telephone (an analog telephone that can use only one channel on one line) 22 via the ISDN 20 and the analog network 21.

FIG. 1 shows an ISDN communication apparatus 1 according to one embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration (shown as 1A or 1B in FIG. 2).

In FIG. 1, 101 is an operation unit, 102 is a message processing unit, and 103 is an ISDN interface unit (I-INF for short). Channel from I-INF103 to ISDN (1)
And channel (2) is extended and usable.

FIG. 3 is a chart schematically showing an operation flow of the ISDN communication device 1 shown in FIG. 2 according to the present invention.

That is, in step S1, the caller of the telephone
By operating 1, a call mode is transmitted using one channel. Then, in step S2, I-INF1
03 sends out a SETUP (call setup) signal. Then ISDN20
If the network to which the partner device is connected is an analog network, a PROG (progress identifier) signal indicating this is sent out. If the network to which the partner device is connected is ISDN, the Such a PROG signal is not transmitted,
Since it is systematically determined, in step S3, the message processing unit 102 determines this, that is, whether the I-INF 103 has received the PROG signal.

If the determination result is NO, that is, if the partner device is also an ISDN communication device, in step S4, the message processing unit 102 decides to perform transmission of the second channel in the video mode, and in step S5, -Instruct INF103 to transmit. However, there is a case where the second channel of the partner device has already been used by another terminal device that is also connected to the line connected to the partner device, and this is described in step S6. The message processing unit 102 makes a determination based on the signal. If the determination is NO, the process proceeds to step S8 to shift to two-channel communication (videophone) in the call mode and the video (digital communication) mode. If the determination is Yes, the process proceeds to step S7. , Call mode 1
Stop the channel communication (in this case, there is also a method of artificially connecting the second channel as soon as the channel being used by another terminal device becomes available).

If Yes in step S3, that is, if the partner device is a general analog telephone, step S9
In, the message processing unit 102 decides not to transmit the second channel, and maintains one-channel communication in only the call mode, as seen in step S10.

With the above, the outline of the operation of the ISDN communication device according to the present invention can be understood.

Next, in order to better understand the operation of the ISDN communication device according to the present invention, outgoing and incoming call communication is divided into a case where the other device is still an ISDN communication device and a case where the other device is a general telephone. The sequence will be described.

FIG. 4 is a communication sequence diagram in the case where the partner device is also an ISDN communication device.

In this case, when the ISDN communication device 1A makes a call and sends a SETUP (call setting) signal to the ISDN 20, the ISDN 20 sends the signal to the ISDN communication device 1B, which is the partner device, and also calls CALL.
A PROC (call setting acceptance) signal is returned to the ISDN communication device 1A.

Subsequently, an ALERT (call indicating that the communication device 1B is being called) signal is sent from the ISDN communication device 1B side. When the ISDN communication device 1B responds, CONN (response)
A signal is sent. In contrast, ISDN communication device 1A
A CONN ACK (response confirmation) signal is transmitted, and communication of the first channel in the call mode is started.

In this example, after a CALL PROC (call setting acceptance) signal is returned from the ISDN 20 to the ISDN communication device 1A, a PROG signal indicating that the other device is a general telephone is sent from the ISDN 20 to the ISDN communication device 1A. ISDN communication device
In 1A, it is known that the partner device is also an ISDN communication device, and therefore, as shown in FIG. 4, the transmission operation of the second channel is performed.

FIG. 5 is a communication sequence diagram when the partner device is a general telephone.

In this case, when the ISDN communication apparatus 1A makes a call and sends out a SETUP (call setting) signal to the ISDN 20, the ISDN 20 receives the signal and performs an interconnection with the general telephone set 22 via an analog network, and also performs a CALL PROC. (Call setting acceptance) signal is returned to ISDN communication device 1A.

On the other hand, a ring back tone is sent from the general telephone set 22 to the network side. Since the ISDN 20 already knows from the SETUP (call setup) signal that the other device is a general telephone, it sends a PROG (progress identifier indicating that the other device is a general telephone) signal to the ISDN communication device 1A. Will come.

Next, when the general telephone 22 responds, a CONN (response) signal is transmitted from the ISDN 20 to the ISDN communication device 1A. On the other hand, the ISDN communication device 1A sends out a CONN ACK (response confirmation) signal, thereby starting the communication of the first channel in the call mode.

However, in this example, since the PROG signal is sent from the ISDN 20 to the ISDN communication device 1A, the ISDN communication device 1A knows that the other device is a general telephone, and
The transmission of the channel is not performed, and only the one-channel communication is maintained.

〔The invention's effect〕

As described above, according to the present invention, the partner device is
If it is a DN communication device, 2-channel communication can be automatically performed unless it is busy, and if it is a general analog communication device, 1-channel communication can be automatically performed, making it easy to transmit without being aware of the type of the partner device There is an advantage that operation is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an ISDN communication device as one embodiment of the present invention, FIG. 2 is a system configuration diagram showing an example of a communication network including the ISDN communication device according to the present invention, and FIG. 2 is a flowchart showing an outline of the operation flow of the ISDN communication apparatus shown in FIG. 2 according to the present invention, and FIG.
FIG. 5 is a communication sequence diagram when the communication device is a communication device, and FIG. 5 is a communication sequence diagram when the partner device is a general telephone. Description of reference numerals 1, 1A, 1B: ISDN communication device, 2A, 2B: Imaging device, 3A, 3B
... Video display, 4A, 4B ... Codec, 10A, 10B ... Videophone, 20 ... ISDN, 21 ... Analog network, 22 ... General telephone, 101 ... Operation unit, 102 ... Message processing unit ,
103 ISDN interface (I-INF)

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 999999999 Sanyo Electric Co., Ltd. 2-5-5 Keihanhondori, Moriguchi-shi, Osaka (73) Patent holder 999999999 Sharp Corporation 22nd Nagaikecho, Abeno-ku, Osaka-shi, Osaka 22 (72) Inventor Minoru Yasuda 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Kenichi Kashiwagi 2-14-40 Ofuna, Kamakura City, Kanagawa Prefecture Inside the System Research Laboratory (72) Inventor Tohru Takahashi 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Tadashi Fujitsu 5-7-1 Shiba, Minato-ku, Tokyo NEC Inside (72) Inventor Yoshinori Saito 2-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuhiro Fukusaki Osaka Prefecture Univ. City Abeno Ward Nagaike-cho, No. 22 No. 22 in the Sharp Corporation (58) investigated the field (Int.Cl. ^6, DB name) H04M 11/00 - 11/10

Claims (1)

(57) [Claims] 1. An ISDN (Digital Integrated Services Network) having an ISDN interface having a communication processing function.
In an ISDN communication device, 2 available on the interface of the interface unit
Use one of the channels in talk mode,
When a call is sent to the partner device via ISDN, the type of the network to which the partner device is connected is determined based on the signal message notified from the ISDN side. If the network type is ISDN, the remaining one channel is automatically used. An ISDN communication apparatus comprising: a message processing means for transmitting a call in a digital communication mode and not transmitting the remaining one channel when the network is other than ISDN, and maintaining the one channel in a call mode. .