JPH08289112A - Setup method for g4 facsimile equipment - Google Patents

Abstract

PURPOSE: To improve the communication efficiency by returning a 'CONN' message when the facsimile equipment has a function to deal with identification information of a G4 option added to a received setup message so as to avoid erroneous connection. CONSTITUTION: When a terminal equipment A sends a setup message 30 to a ISD network, the ISD network sends a setup acknowledge message to the caller terminal equipment A. Simultaneously the ISD network sends the message 30 to a terminal equipment B being a destination based on a call number 33 in the message 30. When the terminal equipment B is available of call reception, the terminal equipment B returns a reply message 'CONN' and when the ISD network receives the reply message, the ISD network sends it to the caller terminal equipment A. In this case, information denoting communication utilizing a function defined as a G4 option such as file transfer using a G4 protocol or color image data is provided to a high order layer matching performance 38 being an information element of the message 30 so as to conduct negotiation.

Description

Detailed Description of the Invention

[0001]

The present invention relates to ISDN (Integrated)
Services Digital Network, integrated G4 facsimile for high-speed data communication using services, especially using functions defined as G4 options such as file transfer using G4 protocol and color image data. The present invention relates to a G4 facsimile call setting method suitable for efficiently performing the above communication.

[0002]

2. Description of the Related Art A standard for connecting a G4 facsimile to an ISDN is CCITT opened in November 1988.
(International Telegraph and Telephone Advisory Committee) Approved at the general meeting. Up to eight terminals such as telephones and facsimiles can be connected to this ISDN by bus wiring. With such a bus line, when an incoming call is received, an appropriate terminal must accept it. For example, when the called terminal is a facsimile, the telephone must be set not to answer. In order to deal with such a problem, information that specifies the attribute (type) of the terminal,
It is supposed to be told when calling.

Information to be transmitted at the time of such a call includes
Information element (IE) as below
There is. (A) Transfer capability (BC: Bearer Capability) (b) Low layer compatibility (LLC)
ility) (c) High Layer Compatibilty (HLC)
(bility) (d) Called Party Subdadd (CPS)
ress)

The transmission procedure of these information elements is ITU.
(International Telecommunication Union) -TQ. 931). In this transmission procedure, first, the calling user sends a "SETUP" message, and in this message, a device to be called and a transmission capability for designating its attribute,
The above information elements such as low layer compatibility, high layer property, and destination subaddress are added. This message is sent over the D channel. That is, the D-channel layer 3 protocol can indicate the information transfer capability of the terminal, the higher layer protocol type, and the like, and the type of the terminal can be determined by this. Such information elements and ITU-T Q. Regarding the 931 call setting procedure and the like, for example, "Interface '9" issued by CQ publisher
2-6 No. 181 ", pp. 186-191.

For G4 facsimile, file transfer and color image data transmission are under study. However, the ITU-T Q. In 931, the parameter for the negotiation is not defined. That is, the color image data transmission and the file transfer using the G4 protocol are defined as G4 options, and their functions are not specified at the time of call setup. Therefore, when an incoming call is made to the basic interface connected to up to eight terminals, the G4 facsimile without optional functions such as color image data transmission and file transfer may respond. In that case, even though the user wants to communicate in color, the communication is performed in monochrome, or in the worst case, the communication is disconnected.

[0006]

The problem to be solved by the prior art is that, in the prior art, file transfer using the G4 protocol and communication using the function defined as the G4 option such as color image data are performed. In the case where an incoming call is made to the basic interface to which a plurality of terminals are connected, it is impossible to avoid an erroneous connection with a terminal that does not have the G4 option function. An object of the present invention is to solve these problems of the prior art and enable efficient communication using the G4 option function.
It is to provide a call setup method for a facsimile.

[0007]

In order to achieve the above object, a call setup method for a G4 facsimile according to the present invention is (1)
A method of setting up a call for a G4 facsimile using ISDN, wherein the G4 facsimile on the calling side transmits information identifying the G4 optional function at the time of transmission of a G4 optional function such as color image data transmission or file transfer. "Upper layer compatibility" of "SETUP" message to be sent
The G4 facsimile on the receiving side, which is added to the information element, sends the G added to the received “SETUP” message.
4 It is determined whether or not a function corresponding to the identification information of the optional function is provided, and if the corresponding function is provided, “CON
N) message is returned. Also, (2)
In the G4 facsimile call setting method described in (1) above, when the receiving G4 facsimile does not have the function corresponding to the identification information of the G4 optional function, the calling ID information for identifying the calling G4 facsimile is transmitted. When the new incoming call is stored, the calling ID information of the calling G4 facsimile is
It is characterized in that whether or not it has been stored is determined, and if it has been stored, the "CONN" message is not returned. (3) In the G4 facsimile call setting method described in (1) above, the receiving G4 facsimile is
When the function does not have the function corresponding to the identification information of the G4 optional function, the calling ID information for identifying the calling G4 facsimile is stored, and the calling ID information of the calling G4 facsimile is already stored when a new call is received. It is characterized in that it is judged whether or not it is a thing, and if it is already stored, the return of the "CONN" message is delayed. Also, (4) above (1)
In the G4 facsimile call setting method according to any one of (1) to (3), after communication with the G4 optional function is completed,
It is characterized in that when sub-addresses of the G4 facsimiles of the sending side and the receiving side are registered, and communication is performed to the G4 facsimiles in which the sub-addresses are mutually registered using the G4 option function, the registered sub-address is designated to make a call. To do.

[0008]

In the present invention, the G4 option function is negotiated at the time of call setup. As a result, it is possible to prevent a terminal that does not have the optional function from being connected to the calling terminal that wants to use the optional function. When the call is received, the calling ID and the past communication history are checked to change the response condition. As a result, among the terminals connected to the same line, the terminal having the G4 option function can easily answer the incoming call. Further, when a call is made on the assumption that the G4 option function is used, a subaddress is designated, so that one terminal can be specified from a plurality of terminals connected to the same line to make a call. In this case, when the G4 option function is not used, subaddressing is not performed, so that any terminal can respond.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a flow chart showing a first embodiment of the processing operation according to the present invention of the G4 facsimile call setting method of the present invention, and FIG. 2 is a block diagram showing a configuration example of a G4 facsimile which performs the operation. is there. In FIG. 2, 10 is a G4 facsimile, 11 is ISDN, and 1 is I.
The ISDN communication unit, which is connected to the SDN 11 and executes call control and signal transmission / reception when the ISDN 11 makes and receives a call, 2 is a G
4 G4 transmission control unit for performing known transmission control of the facsimile 10, 3 for reading original images and recording images on recording paper,
Further, a facsimile image processing unit 4 for performing data compression and decompression processing of image information, an operator performs various operations, and an operation display unit 5 for displaying an operation state of the apparatus and the like.
4 is a system memory for storing information such as programs and data necessary for the operation of the facsimile 10, and 6 is a system control unit for controlling the above-mentioned units based on the stored program method by the CPU.

At the time of calling, the G4 facsimile 10 sends the "SETUP" message having the structure shown in FIG. 3 to the I message shown in FIG.
TU-T Q. 931 to send to the other terminal according to the procedure. As shown in FIG. 3, the “SETUP” message 30
Is a protocol identifier 3 for identifying the protocol
1, a call number length 32 indicating the length of a call number, a call number 33, a SETUP 34 indicating a message type, a transfer capability 35 for declaring a transfer capability, a channel identifier 36 for determining a channel to be used, and a terminal specified. Information elements such as a destination sub-address 37 for high-layer protocol compatibility and a high-layer compatibility 38 for performing high-layer protocol negotiation.

When the terminal A transmits this "SETUP" message 30 to the ISDN network as shown in FIG.
The ISDN network uses the call setup confirmation message (CALL PR
OC) is transmitted to the terminal A on the originating side, and this "SETUP" message 30 is transmitted to the terminal B which is the destination based on the call number 33 in the "SETUP" message 30 shown in FIG. The terminal B returns a response message (CONN) if the call can be received. Upon receiving the response message (CONN) from the terminal B, the ISDN network sends this response message (CONN) to the terminal A on the calling side.

In the G4 facsimile of this embodiment, in the "higher layer compatibility 38" which is an information element of the "SETUP" message 30 shown in FIG. 3, G4 options such as file transfer using the G4 protocol and color image data are provided. Negotiation is performed by adding information indicating that the communication uses the defined function. For example, the G4 facsimile on the calling side is shown in FIG.
As shown in, at the time of calling, it is judged whether or not the color image data is sent (step 101). If it is a color, "color" is added to the higher layer consistency 38 in FIG. 3 (step 102), and a "SETUP" message is sent (step 103). If it is not color, for example, the higher layer compatibility 38 in FIG. 3 is set to "G4 class 1" (step 104), and a "SETUP" message is sent (step 103).

The G4 facsimile on the receiving side which has received the "SETUP" message determines whether or not the terminal itself has the "color image data" communication function, as shown in FIG. Step 105). If the communication function for "color image data" is provided, the response message (CONN) is returned (step 106), but if not, the response message (CONN) is not returned (step 107). As described above, in the G4 facsimile of this embodiment, the G4 option function such as communication of "color image data" is negotiated at the time of call setting. As a result, it is possible to avoid connecting a terminal having no optional function to the calling terminal that wants to use the G4 optional function.

Further, if the communication function of "color image data" is not provided and the response message (CONN) is not returned (step 107), the response message (CONN) is not returned to this calling side terminal thereafter. To the effect, or information indicating that the time will be returned after a delay (communication history NG)
Is stored in association with the identification information (calling ID) of the calling terminal (step 108). In this way, the communication history N
By storing G in association with the identification information (calling ID) of the calling terminal, the processing shown in FIG.
It is possible to more efficiently avoid a connection between a calling terminal that wants to use the G4 option function and a terminal that does not have the G4 option function.

FIG. 5 is a flow chart showing a second embodiment of the processing operation according to the present invention of the G4 facsimile call setting method according to the present invention. In this example, the process in step 108 of FIG. 1, that is, the process of storing the communication history NG in association with the identification information (calling ID) of the calling terminal is stored G
4 shows the operation of the facsimile when receiving a call. When the call is received (step 501), first, the identification information (calling ID) of the calling terminal is acquired (step 502). Then, using the calling ID as a key, the communication history stored in advance for each correspondence of the calling ID is referred to (step 503), and if the communication history with the calling terminal is NG, that is, during the previous communication, communication is performed. If the result that the condition is not met and the response is not returned is stored (step 504), the response message (CONN) is not returned (step 505), and the process ends. If the communication history is not NG, the calling ID is stored (step 506) and a response process to the SETUP message is performed (step 507). Then, the processing result at this time, for example, the communication history NG or the like is stored (step 508) and the processing ends.

As described above, in the second embodiment, the receiving side G4 facsimile is connected to the same line by checking the calling ID and the past communication history at the time of an incoming call and changing the response condition. It becomes easier for another terminal having the G4 option capability to answer the incoming call. However, like this,
If you do not respond based on D and communication history,
Even for simple G4 facsimile transmission that does not use the G4 option function, it will not respond.
An embodiment for avoiding such a problem will be described with reference to FIG.

FIG. 6 is a flowchart showing a third embodiment of the processing operation according to the present invention of the call setting method for G4 facsimile according to the present invention. This embodiment is a process in the G4 facsimile on the sending side. As a result of the processing in FIG. 1, the G4 option function normally ends the color image data transmission in advance (step 601), and then the G4 on the sending side.
The subaddresses of the facsimile and the receiving G4 facsimile are registered (step 602). And
At the time of calling (step 603), it is judged whether or not there is a communication history with the partner, that is, it is judged whether or not the sub-address for the partner is registered (step 604).
If there is a communication history, the registered sub-address is added to call (step 605).

If there is no communication history, normal call processing is performed (step 606), and as a result of the call with the subaddress added, it is determined whether or not the communication is successful (step 6).
07), if not, the communication is terminated (step 608),
If successful, the process returns to step 601 to specify and register the subaddresses of the G4 facsimiles on the sending side and the receiving side using a random number. At this time, the G4 facsimile on the called side (reception side) also registers the sub address after the communication is completed. Thus, in the third embodiment, G4
When a call is made on the assumption that the optional function is used, a subaddress is designated, so that one terminal can be specified and called from a plurality of terminals connected to the same line. Also, G
If the 4-option function is not used, no sub-address is designated, so that any terminal can respond.

As described above with reference to FIGS. 1 to 6, in the call setting method of the G4 facsimile of this embodiment, the G4 option function is negotiated at the time of call setting. As a result, it is possible to avoid connecting a terminal that does not have the G4 option function to a calling terminal that uses the G4 option function. Also, the called terminal checks the calling ID and the past communication history at the time of the incoming call and changes the response condition, so that among the terminals connected to the same line, a terminal having the corresponding G4 option capability. Makes it easier to answer incoming calls.

At the calling terminal, when a call is made on the assumption that the G4 option is used, a sub address is designated,
By specifying a terminal and making a call, it is possible to avoid a response from a terminal having no other G4 option function. In this case, at the time of facsimile transmission that does not use the G4 option function, no subaddress is designated, so that any terminal can respond. The present invention is not limited to the embodiments described with reference to FIGS. 1 to 6, and various modifications can be made without departing from the scope of the invention. For example, in the second embodiment shown in FIG. 5, when the communication history corresponding to the acquired calling ID is NG, the process of not responding is performed, but the response time may be delayed.

[0021]

According to the present invention, a basic interface to which a plurality of terminals are connected is provided during communication using a function defined as a G4 option such as file transfer using the G4 protocol or color image data. When there is an incoming call, it is possible to avoid an erroneous connection with a terminal that does not have the G4 option function, and it is possible to improve the efficiency of communication using the G4 option function.

[Brief description of drawings]

FIG. 1 is a flowchart showing a first embodiment of a processing operation according to the present invention of a call setting method for a G4 facsimile according to the present invention.

FIG. 2 is a block diagram showing a configuration example of a G4 facsimile that performs the processing operation in FIG.

FIG. 3 is a “SETUP” used in the process in FIG. 1.
It is explanatory drawing which shows the structural example of a message.

4 is a schematic diagram of ITU-T Q.3 of ISDN and G4 facsimile in FIG. 9 is a sequence diagram showing an example of a call connection procedure based on the regulations of 931. FIG.

FIG. 5 is a flowchart showing a second embodiment of the processing operation according to the present invention of the call setting method for G4 facsimile according to the present invention.

FIG. 6 is a flowchart showing a third embodiment of the processing operation according to the present invention of the G4 facsimile call setting method of the present invention.

[Explanation of symbols]

1: ISDN communication unit, 2: G4 transmission control unit, 3: facsimile image processing unit, 4: operation display unit, 5: system memory, 6: system control unit, 10: G4 facsimile, 1
1: ISDN, 30: "SETUP" message, 3
1: protocol identifier, 32: call number length, 33: call number, 34: SETUP, 35: transfer capability, 36: channel identifier, 37: destination subaddress, 38: higher layer compatibility

Claims (4)

[Claims] 1. A call setting method for a G4 facsimile using ISDN, wherein the G4 facsimile on the calling side identifies the G4 optional function when transmitting the G4 optional function such as color image data transmission or file transfer. To
The G4 facsimile on the receiving side corresponds to the identification information of the G4 optional function added to the above-mentioned "SETUP" message received by adding it to the "upper layer compatibility" information element of the "SETUP" message sent at the time of calling. A method for setting up a call for a G4 facsimile characterized in that it determines whether or not it has the function described above, and returns a "CONN" message when it has the corresponding function. 2. The G4 facsimile call setting method according to claim 1, wherein the receiving G4 facsimile is
When the function does not have the function corresponding to the identification information of the G4 option function, the calling ID information for identifying the calling side G4 facsimile is stored, and the calling ID information of the calling side G4 facsimile is stored at the time of a new incoming call. A method for setting up a call for a G4 facsimile, characterized in that it is determined whether or not it is already stored, and if it is already stored, a "CONN" message is not returned. 3. The G4 facsimile call setting method according to claim 1, wherein the receiving G4 facsimile is
When the function does not have the function corresponding to the identification information of the G4 option function, the calling ID information for identifying the calling side G4 facsimile is stored, and the calling ID information of the calling side G4 facsimile is stored at the time of a new incoming call. A method for setting up a call for a G4 facsimile characterized in that it is determined whether or not it is already stored, and if it is already stored, the return of the "CONN" message is delayed. 4. The G4 facsimile call setting method according to any one of claims 1 to 3, wherein after the communication with the G4 optional function is completed, the subaddresses of the originating and receiving G4 facsimiles are registered. , The above G to the G4 facsimile which mutually registered the sub-address
4 When performing communication using the optional function, the sub-address registered above is designated to make a call.
4 Facsimile call setup method.