JPH09186791A - Transmitter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain incoming call transfer with only one B channel of ISDN by storing image information once to a memory in the case of receiving facsimile communication data and image information when a transfer destination is set and transferring the data to a designated transfer destination after the end of reception. SOLUTION: The transmitter-receiver 10 has a system control section 14 consisting of a CPU 12 and a ROM, a RAM 16, a nonvolatile storage device 18 and an operation display device 20 or the like and a memory 42 being an input output buffer and an incoming call transfer processing section 44 or the like. Upon the receipt of a SETUP message, the receiver side discriminates whether or not the call reception transfer destination is stored in the RAM 16. When no transfer destination is stored, the usual call reception processing is conducted. When the transfer destination is stored, after an idle area of the memory 42 is confirmed, a B channel of a sender is connected, the image information is stored in the memory 42 and after the end of reception, the information is transferred to the designated transfer destination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case in which facsimile communication designation data and image information indicating that the communication is facsimile communication is received in a state in which it is connected to ISDN (Integrated Services Digital Network) and a transfer destination is set. , A transmission / reception device that transmits image information to a set transfer destination.

[0002]

2. Description of the Related Art IS that does not provide a call transfer service
A terminal having an incoming call forwarding function for enabling incoming call forwarding even when connected to a DN is disclosed in JP-A-2-90758 and JP-A-2-134948.

The terminals described in these publications use the SE from the source as shown in the signal sequence of FIG.
When the CONN (response) message is transmitted in response to the TUP (call setup) message and one B channel (B1 channel in FIG. 4) is connected to the B channel of the transmission source via ISDN, the transfer destination is designated. Send the SETUP message and send it via ISDN to the other B channel (B2 in FIG. 4).
Channel) is connected to the transfer destination B channel,
These B channels are connected via a switch to transfer incoming data.

[0004]

However, when one B channel is connected to the source, when the other B channel is used for communication with another terminal, data transfer is performed. I couldn't. Moreover, since two B channels are used for one communication at the time of data transfer, it is impossible to communicate with other terminals.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a transmitting / receiving apparatus capable of transferring incoming data by one B channel.

[0006]

A transmission / reception apparatus according to the present invention is connected to an ISDN and transmits / receives facsimile communication designation data indicating that the communication is facsimile communication and image information, and a storage unit for storing the image information. The image information storage unit and the image information received when receiving the facsimile communication designation data and the image information in a state where the transfer destination is set are stored in the image information storage unit and stored after the reception of the image information is completed. And a control unit that causes the transmission / reception unit to transmit the image information to the transfer destination.

According to the present invention, when the transmission / reception unit receives the facsimile communication designation data and the image information while the transfer destination is set, the control unit causes the image information storage unit for storing the image information. The received image information is stored, and after the reception of the image information is completed, the transmitting / receiving unit is caused to transmit the stored image information to the transfer destination.

As described above, according to the present invention, in the facsimile communication which does not require real-time property, the image information is received and the image information is transmitted to the transfer destination at different times, so that one B channel is used. Call forwarding can be done and the other B channel can be used for another communication.

It is to be noted that, in addition to the facsimile communication designation data and the image information, the transmission / reception unit receives the data amount of the image information, and the transmission / reception unit sets the facsimile communication designation data in a state where the transfer destination is set. If the image information data amount and the image information are received and the received data amount is less than or equal to the free space of the image information storage unit, the received image information is stored in the image information storage unit, and after the reception of the image information is completed. Sends the stored image information to the transfer destination, and when the amount of received data is larger than the free space of the image information storage unit, transfers the received image information to the transmitter / receiver in parallel with the reception of the image information. It may be transmitted first, and in this case as well, the number of times two B channels are used for one communication can be reduced to enable efficient communication.

[0010]

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

FIG. 1 shows a transmitter / receiver 10 according to an embodiment of the present invention. The transmission / reception device 10 includes a CPU 12 for controlling the transmission / reception device 10 as a whole, a system control unit 14 including a ROM for storing a program for controlling the transmission / reception device 10 as a whole, a control routine to be described later, a RAM 16, and the like. A non-volatile storage device 18 configured by a magnetic disk or the like for storing various data,
An operation display device 20 for inputting a transfer destination and displaying input data, a reading device 22 for reading a document, an image processing device 24 for performing encoding and decoding of image information, and enlarging and reducing, and the like, Image storage device 26 for storing image information
, A communication control unit 28 for controlling communication suitable for digital networks such as G4 facsimile communication, and a signal input from a subscriber line (2B + D), which is connected to an ISDN, to two B channels (B1 channel, B2 channel). ) And ISDN basic interface device 30 for separating into D channel
And ISD controlling layer 2 and layer 3 of ISDN
N signal processing unit 32, switch unit 34, and codec unit 36 that performs mutual conversion between analog signals and digital signals.
And an audio module 38 containing a speaker and a microphone
Is connected to the audio module control unit 40 for controlling the audio module 38, a memory 42 configured by a RAM as an input / output buffer, and image information stored in the memory 42 is transferred by a transfer signal from the CPU 12, An incoming call transfer processing unit 44 that outputs a transfer completion signal to the CPU 12 when the transfer is completed.
6 are connected to each other.

Further, the ISDN basic interface device 3
0 and the ISDN signal processing unit 32 are mutually connected, and the ISDN basic interface device 30 outputs a signal on the D channel to the ISDN signal processing unit 32 and I
The signal from the SDN signal processing unit 32 is output to the D channel.

Further, the ISDN basic interface device 30 and the switch section 34 are connected to each other, and
The DN basic interface device 30 outputs a signal on the B channel to the switch unit 34 and outputs a signal from the switch unit 34 to the B channel.

Further, the switch section 34 is a codec section 36.
And connects the B channel instructed by the signal from the CPU 12 to the system bus 46 or the codec unit 36, or connects the B channels to each other. Further, the codec section 36 is mutually connected to the voice module control section 40.

The RAM 16 has a storage area as a work area.
Area, the free space of the memory 42, and the memory 42
Input amount from the operation display device 20
The transferred destination and each of the B1 and B2 channels.
Therefore, these B channels are used to store the image information to be transferred.
Indicator n for identifying whether or not it has been used
(N ₁, N_Two) Or the data of the image information stored in the memory 42.
A region for storing the data amount is formed.

Next, the operation of the embodiment of the present invention will be described. In the initial state, the indicators n ₁ and n ₂ respectively corresponding to the B1 channel and B2 channel are
The corresponding B1 channel and B2 channel are set to 0 indicating that they are not used to store the image information to be transferred, the free space of the memory 42 is made equal to the memory capacity of the memory 42, and the storage amount of the image information is 0. It is said that.

When a power source (not shown) is turned on, it is determined in step 100 of FIG. 2 whether a SETUP message has been received. The SETUP message includes a protocol identifier, a call number, a message type, a transmission capability, a calling number, a called number, a lower layer compatibility, and a higher layer compatibility as necessary.

When the SETUP message is received, the operation display device 20 is stored in the RAM 16 in step 102.
It is determined whether or not the transfer destination input from is stored. If the transfer destination is not stored in the RAM 16,
In step 104, a normal incoming call process is performed and the routine is ended. When this communication is a facsimile communication in the normal incoming call processing, the image information stored in the memory 42 as an input / output buffer is sequentially sent to the image storage device 26, and then a series of necessary processing such as decoding is performed. Is done.

On the other hand, if the transfer destination is stored in the RAM 16, the determination at step 102 is affirmative, and it is determined at step 106 whether this communication is facsimile communication. Whether it is a facsimile communication, SETUP
If the message includes higher layer compatibility, it depends on whether or not a higher layer characteristic identification designating G2 or G3 facsimile or G4 facsimile as facsimile communication designation data is included,
If the SETUP message does not include high-layer compatibility, unrestricted digital (G4 facsimile communication) or 3.1k as facsimile communication designation data
Hz audio (G2 or G3 facsimile communication)
Judgment is made based on whether or not the information transfer capability that specifies is included.

If this communication is not facsimile communication, telephone simultaneous transfer processing is performed in step 108, and the routine ends. In the simultaneous telephone transfer processing, control signals are transmitted and received according to a predetermined procedure, and when the responding B channel and the B channel of the transmission source are connected, a call is made to the transfer destination via the ISDN signal processing unit 32 and ISDN. Done,
When the other B channel and the B channel of the transfer destination are connected, the switch unit 34 connects the B channel connected to the transmission source and the B channel connected to the transfer destination. As a result, the voice information from the transmission source is transmitted to the transfer destination via the transmission / reception device 10. Further, when a DISC (disconnect) message is received from the source via ISDN, control signals are transmitted and received according to a predetermined procedure, and when the responding B channel and the source B channel are disconnected, ISDN When the DISC message requesting the disconnection of the connection with the transfer destination is transmitted to the ISDN via the signal processing unit 32 and the other B channel and the transfer destination B channel are disconnected, the B channel is sent to the switch unit 34. Cancel the connection between each other.

On the other hand, if this communication is facsimile communication, in step 110, the data amount of the image information transmitted from the transmission source is acquired by the negotiation of the protocol of the facsimile communication and stored in the RAM 16,
In step 112, the free space of the memory 42 stored in the RAM 16 is read.

In the next step 114, it is determined whether the amount of image information data is less than the free space of the memory 42. If the amount of image information data is less than the free space of the memory 42, step 116 is performed. The switch section 34 connects the B channel used for the response and the system bus 46. In the next step 118, the CONN message is transmitted to the ISDN via the ISDN signal processing section 32. As a result, the ISDN connects this B channel to the B channel of the transmission source, and the image information transmitted from the transmission source is stored in the memory 42 via this B channel and the system bus 46. In the next step 120, the indicator n (n ₁ or n ₂ ) corresponding to the B channel used for the response is set to
The B channel is set to 1 indicating that it is used to store image information to be transferred, and this is stored (updated) in the RAM 16. In the next step 122, the free space of the memory 42 stored in the RAM 16 and the data amount of the image information being stored are read, and the value obtained by subtracting the data amount of the image information being stored from the read free space of the memory 42 is stored in the memory 42. The new free space is stored (updated) in the RAM 16 and the routine ends.

On the other hand, if the data amount of the image information is larger than the free space of the memory 42, the facsimile simultaneous transfer process is performed in step 124, and the routine is ended. In the simultaneous facsimile transmission process, the switch unit 34 connects the B channel used for response and the system bus 46, and
The CONN message is transmitted to the ISDN via the SDN signal processing unit 32. As a result, the ISDN connects the B channel and the B channel of the transmission source, and the image information transmitted from the transmission source is transmitted to the B channel and the system bus 46.
Is stored in the memory 42 via. Next, when the other B channel and the system bus 46 are connected to the switch unit 34, the SETUP message with the transfer destination designated is transmitted to the ISDN via the ISDN signal processing unit 32, and when the CONN message is received from the ISDN, The image information is sequentially read from the memory 42 in the order of arrival and is transmitted to the transfer destination. The reception of the image information and the transmission of the image information to the transfer destination are performed in parallel. In addition, the DIS from the sender via ISDN
When the C message is received, the switch unit 34 releases the connection between the B channel used for the response and the system bus 46, and the ISDN signal processing unit 32 is used to send the ISDN signal.
Send a REL (Release) message to. Then, when the transmission of the image information stored in the memory 42 to the transfer destination is completed, a DISC message requesting the disconnection of the connection with the transfer destination is transmitted to the ISDN via the ISDN signal processing unit 32, and the ISDN is transmitted. When the REL message is received from the switch unit 34, the switch unit 34 releases the connection between the B channel used for the transfer and the system bus 46, and the REL COMP (release completion) message is sent to the ISDN via the ISDN signal processing unit 32. Send.

On the other hand, in step 100, the SETU
If no P message has been received, step 12
DIS at 6 when receiving a normal call or storing image information to be transferred
It is determined whether the C message is received. When the DISC message is not received, the process proceeds to step 140, and when the DISC message is received, the B channel used for the response to the switch unit 34 in step 128 is connected to the system bus 46 or the codec unit 36. Is canceled, and in the next step 130, the ISDN signal processing unit 3
2. Send REL message to ISDN via 2. In the next step 132, the indicator n (n ₁ or n) corresponding to the B channel used for the response is sent from the RAM 16.
₂ ) is read out, and it is judged whether or not the indicator n (n ₁ or n ₂ ) read out in step 134 is ₁ indicating that this B channel was used for storing image information to be transferred.

If the read indicator n (n ₁ or n ₂ ) is not 1, the process proceeds to step 140, and if the read indicator n (n ₁ or n ₂ ) is 1, it is stored in the RAM 16 at step 136. The amount of accumulated image information and the amount of data of the image information that has been accumulated are read, and the sum of these is used as the accumulated amount of new image information in the RAM 1
6 (stored (updated) in step 6), and the indicator n (n ₁ or n corresponding to the B channel used for the response in step 138).
₂ ) is set to 0 and stored (updated) in the RAM 16.

In the next step 140, the accumulated amount of image information is read from the RAM 16, and in step 142 it is determined whether the accumulated amount of read image information is 0 or not. If the accumulated amount of read image information is not 0, step 1
At 44, the switch unit 34 connects the B channel used for transfer and the system bus 46.

In the next step 146, the transfer destination is read out from the RAM 16 and the ISN is read via the ISDN signal processing section 32.
A SETUP message specifying the transfer destination is transmitted to SDN.

At the next step 148, it is determined whether or not a message is received from the ISDN. If no message is received, the process waits. If a message is received, the message received at step 150 is CONN.
It is determined whether the message is a message. When the received message is not the CONN message, the routine is ended, and when the received message is the CONN message, in step 152, the incoming call transfer processing unit 44 is instructed to transfer the image information stored in the memory 42. Output the transfer signal.

In the next step 154, the accumulated amount of image information stored in the RAM 16 and the data amount of image information being transferred are read out, and a value obtained by subtracting the data amount of image information being transferred from the accumulated amount of image information is obtained. RAM1 as the storage amount of new image information
Store (update) in 6 and terminate the routine.

On the other hand, in step 142, when the accumulated amount of the read image information is 0, step 156
Then, it is determined whether or not the transfer completion signal is output from the incoming call transfer processing unit 44. If the transfer completion signal is not output, the routine is ended, and if the transfer completion signal is output, step 158 Then, a DI requesting the ISDN to disconnect the connection to the transfer destination via the ISDN signal processing unit 32.
Send SC message.

In the next step 160, ISDN to R
It is determined whether or not the EL message is received, and if the REL message is not received, the process waits. If the REL message is received, in step 162, the B channel used for transfer to the switch unit 34 is transmitted. The system bus 46 to disconnect the ISDN from the ISDN.
The REL COMP message is transmitted to the ISDN via the signal processing unit 32.

In the next step 166, the free space of the memory 42 stored in the RAM 16 and the data amount of the transferred image information are read, and the sum of these is stored (updated) in the RAM 16 as a new free space, and in step 168. , RA
The data amount of the transferred image information stored in M16 is erased, and the routine ends.

In FIG. 3, the terminal C as the transfer destination is the RAM 16 of the terminal A as the transmission / reception device 10 according to the present embodiment.
And the signal sequence of facsimile communication when the data amount of image information is less than or equal to the free space of the memory 42 is shown.

As shown in FIG. 3, when the terminal B, which is the source, sends to the ISDN a SETUP message designating the terminal B as the destination, the ISDN sends this S message.
Transfer the ETUP message to terminal A. If the SETUP message satisfies the predetermined condition, the terminal A sends a CONN message to the ISDN. Upon receiving the CONN message from the terminal A, the ISDN transmits a CONN ACK (acknowledgement) message to the terminal A and a CONN message to the terminal B. As a result, the B channel of the terminal A (for example, B1 channel) and the B channel of the terminal B are connected, and the image information from the terminal B is stored in the memory 42 of the terminal A.

When the transmission of the image information is completed, a DISC message is transmitted from the terminal B, which is the transmission source, to the ISDN, the ISDN disconnects the B channel of the terminal A and the B channel of the terminal B, and the REL is transmitted to the terminal B. A message is sent and a DISC message is sent to the terminal A with respect to the terminal A. The terminal A releases the corresponding B channel for the DISC message and transmits the REL message, and the terminal B releases the corresponding B channel for the REL message and transmits the REL COMP message. Then, ISDN responds to the REL message of terminal A with RE.
The L COMP message is transmitted, and the disconnection recovery work of the B channel is completed.

Next, the terminal A sends to the ISDN a SETUP message designating the terminal C which is the transfer destination,
ISDN forwards this SETUP message to terminal C. Thereafter, the same procedure as the above-mentioned calling procedure is performed, and the B channel (for example, B1 channel) of the terminal A and the B channel of the terminal C are performed.
The channel information is connected, and the image information stored in the memory 42 of the terminal A is transferred to the terminal C.

As described above, the transmitting / receiving apparatus 10 according to the embodiment of the present invention receives the image information when the data amount of the image information is less than the free space of the memory 42 in the facsimile communication which does not require the real-time property. Memory 4
The image information is temporarily stored in 2, and the image information is transmitted to the transfer destination after the reception is completed, and the image information reception and the image information transmission to the transfer destination are performed at different times. Therefore, the transmission / reception device 10 according to the embodiment of the present invention can perform incoming call transfer of image information even when there is only one free B channel, and two B channels are used for one communication. The number of times it is used can be reduced to allow use of the other B channel for other communications.

Even when the image information stored in the memory 42 cannot be transmitted to the transfer destination and the transfer process is temporarily stopped, if there is only one free B channel, this image information is transferred to the transfer destination. Until another message is sent, the free space of the memory 42 is secured, or a RAM having a large memory capacity is used as the memory 42, and the data amount of the image information and the free space of the memory 42 are used. All the received image information may be stored in the memory 42 without comparing with.

[0039]

The transmitter / receiver according to the present invention performs reception of image information and transmission of the image information to the transfer destination at different times in facsimile communication that does not require real-time processing. Call transfer can occur on a channel and the other B channel can be used for another communication.

Further, the transmitting / receiving apparatus according to the present invention, when the communication data amount is equal to or less than the free space of the data storage unit in the facsimile communication which does not require real-time property,
Since the reception of image information and the transmission of this image information to the transfer destination are performed at different times, the number of times two B channels are used for one communication can be reduced to enable efficient communication. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission / reception device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control routine of a CPU of the transmission / reception device of FIG.

FIG. 3 shows a case where the terminal C is set as a transfer destination, the communication is facsimile communication, and the data amount of image information is less than or equal to the free space of the memory of the terminal A as the transmission / reception device according to the embodiment of the present invention. It is a figure which shows a signal sequence.

FIG. 4 is a diagram showing a signal sequence in the case where data is transferred as an incoming call in the prior art.

[Explanation of symbols]

 10 transmitter / receiver 12 CPU 14 system control unit 16 RAM 30 ISDN basic interface device 32 ISDN signal processing unit 34 switch unit 42 memory

Claims (2)

[Claims] 1. A transmission / reception unit connected to an ISDN for transmitting / receiving facsimile communication designation data and image information indicating facsimile communication, an image information storage unit for storing image information, and a transfer destination are set. The image information received when the facsimile communication designation data and the image information are received in the state of being stored in the image information storage unit, and the image information stored after the reception of the image information is transferred to the transmission / reception unit. A transmission / reception device comprising: a control unit for transmitting first. 2. A transmission / reception unit connected to the ISDN for transmitting / receiving facsimile communication designation data indicating that the communication is facsimile communication, a data amount of image information and image information, and an image information storage unit for storing the image information. When receiving the specified facsimile communication data, the amount of image information and the image information with the transfer destination set,
When the received data amount is less than or equal to the free space of the image information storage unit, the received image information is stored in the image information storage unit, and the image information stored after the reception of the image information is transmitted and received. When the amount of received data is larger than the free space of the image information storage unit, the transmission / reception unit transmits the image information received in parallel with the reception of the image information to the transfer destination. A transmission / reception device, comprising: