JPH02105666A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To improve rapidity in communication by attaching an interruption function on an exchange, and making facsimile equipment identify an emergency message by attaching the emergency message on a facsimile call and attaching the display function of the emergency message on the facsimile equipment. CONSTITUTION:When a caller station C desires to communicate with a callee station A, the exchange PBX of the callee station A transfers an incoming call signal to the callee station A when the callee station A is communicating with another station B. As the incoming call signal, a signal with a band area not being a disturbance signal for a message from another station B can be accepted. The callee station A receives a page completion signal from another station included in a phase D, and transmits a temporary holding signal to another station B. The callee station A receiving the temporary holding signal from another station B sends a line switching signal to the exchange PBX. The exchange PBX receiving the line switching signal switches a line from another station B to the caller station C. After communication with the caller station C is completed, the callee station A transmits the line switching signal to the exchange again, then, starts the communication with another station B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile communication system, and particularly to a facsimile communication system suitable for establishing communication when the other party's line is blocked.

[Conventional technology]

Conventionally, the Hitachi high-speed facsimile HIFA was used as a means to urgently send a document to the other party using a facsimile machine.
As discussed on page 35 of the X47 instruction manual, the word "urgent" was added to the beginning of the image received by the other party as a message to the called station. Therefore, the total length of the receiving paper of the called station is longer than a normal receiving paper, so even if there are other messages in the receiving tray, there is no risk of them getting mixed up. However, the current situation is that you don't notice it unless you look at your inbox. Furthermore, this method is not possible if the line at the called station is blocked.

A possible solution is to use a call waiting service. Call waiting service is provided for telephone service, and as shown in Figure 8, calling station C is called station A.
If the called station A is already communicating with another station B, the PBX to which the called station A is subscribed will notify the called station A that there is an incoming call from the calling station C. When the user of called station A hooks up, the communication station is switched from B to C. After communication between called station A and calling station C is completed, communication with another station B is resumed. A feature of call waiting services is that line switching is always done manually.

Therefore, when called station A and another station B are communicating by facsimile, calling station C cannot interrupt the communication. Furthermore, since the interrupt signal from the calling station C enters the line between the called station A and the other station B, it also causes image disturbance, as described in the call waiting catalog.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into consideration the possibility of using important information even if the other party's line is blocked in the facsimile communication system, and there is a problem in terms of immediacy.

An object of the present invention is to solve the above problems.

[Means to solve the problem]

The above object is achieved by providing the exchange with an interrupt function, adding an emergency message to the facsimile call, allowing the facsimile machine to identify the emergency message, and providing the function of displaying the emergency message.

[Effect]

When the exchange receives an incoming call from the calling station, if the called station's line is open, it connects as is, and if it is busy, it sends the incoming call number 4 to the called station.

The called station that received the incoming call No. 4 temporarily suspends the signals of other stations that are already being received, and sends a line switching signal to the exchange.

Upon receiving this signal, the exchange cuts off the other station's line.

Switch to the calling station's line. The facsimile machine of the called station determines whether the message is different from that of the other station, and if it is a different message, outputs it to a different output tray, so that the information can be sent quickly and reliably.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

When calling station C attempts to communicate with called station A.

If the called station A is already communicating with another station B, the exchange PBX of the called station A transfers the incoming call number 4 to the called station A. Incoming call No. 4 may be a signal in a band that does not interfere with messages from other station B.

The facsimile machine F of the called station A has a bypass filter HPF with a cutoff frequency of 400Hz and a cutoff frequency of 100Hz.
A low-pass filter LPF is provided, and an exchanger P
There is no problem if the BX outputs incoming call number 4 below 100Hz. The subsequent sequence will be explained using FIG. If the facsimile control unit FC which received the incoming call No. 4 has time to receive the signal indicating the end of the message page from the other station B, it may send back a signal confirming the incoming call No. 4 to the exchange at a low frequency. Then, the exchange PBX makes the calling station wait until a line switching signal is received from the called station A.

By the way, message transmission using a facsimile machine is
The time series is determined based on CCITT (International Telegraph and Telephone Consultative Committee) Recommendation T.30 as shown in Figure 3. That is, a facsimile call consists of five phases. Phase A is to set up the call, phase B is to identify the function, confirm the conditions for communication, and command the selected conditions, and phase C is to simultaneously perform the in-message procedure phase C1 and the message transmission phase C2, and the in-message procedure C1 Phase D provides complete signals for in-message procedures, such as in-message synchronization, error detection and correction, and transmission line monitoring; Phase D provides post-message signals for message end signals, confirmation signals, multiple original signals, facsimile control procedure end signals, etc. Phase E of the procedure is the cancellation of the facsimile call.

Called station A receives a page end signal from another station included in phase D and sends a temporary hold signal to other station B. Upon receiving a temporary hold recognition signal from other station B.

Called station A sends a line switching signal to the exchange PBX.

Line switching signals may use the same frequency band as facsimile messages, provided they are not confused with facsimile calls, and to prevent false alarms, a low frequency band may be used.

Upon receiving the line switching signal, the exchange PBX switches the line from other station B to calling station C. After the communication with the calling station C is completed, the called station A again transmits a line switching signal to the exchange and resumes communication with the other station B.

In the unlikely event that calling station C is a telephone, the exchange similarly sends the incoming call number 4 to called station A, so if it is a telephone, the facsimile control unit FC does not send a temporary hold signal to other station B, but simply sends the call. You may continue. The method for distinguishing between a telephone and a facsimile is described in the above-mentioned CCITT Recommendation T, 30, and is well known.

FIG. 4 shows another embodiment according to the present invention. In order to eliminate the unfairness that other station B is temporarily on hold until the communication between calling station C and called station A is completed, memory control is applied to the exchange PBX. The system is equipped with a section MC, a memory M, and a switching device S that connects and connects the memory and the line. In Figure 2, when called station A issues a line switching signal from Kyokutsuki B to calling station C, exchange PB
X connects the line of other station B to memory M, resumes communication with other station B, and imports the message into memory. If the message ends before calling station C ends communication, the line with other station B is disconnected at that point. After the calling station C completes the communication, the message in the memory is read out to the called station A.

In addition, Fig. 5 does not require memory as shown in Fig. 4, and eliminates the unfairness that the other station B is temporarily on hold until the communication between one calling station C and the called station A is completed. , other station B
This is another embodiment in which the called station A alternately sends a line switching signal to the exchange PBX each time the page of each message of the calling station C is completed.

By the way, so far the explanation has been about message communication. Next, the output of the obtained message will be explained. Messages from other station B and calling station C received by facsimile control section FC are outputted via recording section PR. At this time, in order to prevent message confusion between other station B and calling station C, as shown in FIG.

It is preferable to provide trays tl and t2 so that, for example, messages from other station B are output to tray t1 and messages from calling station C are output to tray t2.

Further, if the called station A is able to interrupt communication with another station B only when the calling station C sends an emergency message, there is less risk of bothering the other station B. In this case, if the facsimile machine of the calling station C is set with a switch for transmitting an emergency message, it is easy to incorporate the code into the phase B.

It is possible to determine whether a message is urgent by incorporating a code into phase B of FIG. That is, in Fig. 6,
After recognizing the incoming call from calling station C, it temporarily puts other station B on hold and when communicating with calling station C, determines whether it is an emergency message, and if it is an emergency message, starts communicating with calling station C, If the message is not an emergency message, the message from the calling station C is not received and communication with the other station B may be resumed.

Furthermore, in order to reduce the temporary holding time of other station B even for emergency messages, it is possible to limit the number of emergency messages that can be received to a certain number.

In addition, as shown in Figure 4, the PBX exchange is equipped with a memory function so that while called station A is receiving an emergency message from one calling station C, the message from another station B is stored in the exchange. It is also possible to reduce the temporary holding time.

Alternatively, if it is an emergency message, calling station C can interrupt the message, but in that case, as shown in Figure 5, the called station A will receive an emergency message, and as shown in Figure 5, other station B and calling station C will alternately send page after page. You may also do so.

Furthermore, in the called station A, it is convenient for the users of the called station A to use one of the two trays provided in FIG. 1, for example, tray t2, as a tray exclusively for emergency facsimiles.

Furthermore, a paper detection sensor-PS is attached to the tray t2 for detecting a message in the emergency message tray t2, and when an emergency message is detected, the facsimile control unit FC shown in Fig. 1 is notified and the message is displayed on the display unit DSP. 0 to be done
The information may be displayed by voice, or by displaying it on a liquid crystal panel if available. As shown in FIG. 7, if the emergency message is not retrieved even after a fixed or irregular period of time has elapsed, the user of the called station A can be more conveniently contacted.

〔Effect of the invention〕

According to the present invention, messages can be transmitted from calling station C even when called station A is communicating with another station B, and called station A can also receive messages without confusing them with messages from other station B. This has the effect of further increasing the speed of facsimile communication.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a facsimile communication system according to an embodiment of the present invention, FIG. 2 is a sequence diagram thereof, FIG. 3 is an explanatory diagram of a facsimile call, FIG. 4 is a schematic diagram of another embodiment, and FIG. FIG. 6 is a sequence diagram thereof, FIGS. 6 and 7 are sequence diagrams of other embodiments, and FIG. 8 is an explanatory diagram of a conventional example. A...Called station, B...Other station, C...Calling station, PB
X...exchange machine, F...facsimile machine, FC...
-Facsimile control unit, tl. t2...tray. Fig. Fig. Fig. Fig. 8 → AA Other station B R station C Fig. 4 Fig. 6 Call station A

Claims (1)

[Scope of Claims] 1. A facsimile communication system characterized in that a facsimile device is provided with an interrupt recognition function that allows a message to arrive even when a called station with which a calling station is communicating is communicating with another station. 2. In claim 1, the called station is notified of the arrival of a message from the calling station, and
When a response is received from the called station, the line of the other station is temporarily put on hold, the line of the calling station is connected, and the line of the other station is restored after the message from the calling station is completed. A facsimile communication system characterized by having a switchboard. 3. In claim 2, the exchange has a memory function, and upon receiving a response from the called station, the line of the other station is disconnected, and the information of the other station is stored in the memory of the exchange. and connects the line between the called station and the calling station, and after the facsimile communication is completed, the information of the other station stored in the memory of the exchange is read out to the called station. facsimile communication method. 4. In claim 2, the facsimile machine is provided with means for identifying whether the message is from a voice device or a non-voice device, and only when the calling station is a non-voice device. A facsimile communication method characterized by the ability to accept facsimile. 5. A facsimile communication system characterized in that a facsimile device has a function of transmitting an emergency message in addition to a message from a calling station to a called station and identifying the emergency message from received messages. 6. The facsimile communication system according to claim 5, characterized in that the emergency message is provided in phase B of a pre-message procedure of a facsimile call. 7. In claim 6, when the called station is already communicating with another station, the switching equipment is provided with a function of notifying the called station that a message has arrived from the calling station; The facsimile device is provided with a function in which the called station responds to the exchange only when the called station identifies an emergency message, and the exchange receives a response from the called station to notify the other station. Put the line on hold temporarily and connect the line of the calling station,
A facsimile communication system characterized in that the exchange has a function of restoring the line of the other terminal after the end of the emergency message. 8. In claim 7, the exchange has a memory function, and upon receiving a response from the called station, the line of the other station is disconnected, and the information of the other station is stored in the memory of the exchange. The system also connects the line between the called station and the calling station, and after the emergency message ends, the information of the other station stored in the memory of the exchange is read out to the called station. facsimile communication method. 9. In claim 2, messages from the other station and the calling station are alternately received in page units, and
A facsimile communication system characterized in that a facsimile device has a function of sending a line switching response signal to the exchange every time one page is received. 10. In claim 9, the facsimile device is provided with a function to determine whether the message is an emergency message or a non-urgent message, and the interruption to the called station is limited to the urgent message from the calling station. A facsimile communication method characterized by: 11. The facsimile communication system according to claim 5, characterized in that the number of emergency messages is set to a certain amount. 12. In claim 2, the facsimile machine of the called station is provided with at least two message output trays, and the message of the other station and the message of the calling station are placed in separate trays. A facsimile communication method characterized by ejection. 13. The facsimile communication system according to claim 5, wherein the emergency message received by the called station is discharged into a special tray of a facsimile machine separately provided for emergency use. 14. The facsimile communication system according to claim 5, characterized in that the facsimile machine is provided with a transmission switch exclusively for the emergency message. 15. The facsimile communication system according to claim 14, further comprising a sensor for detecting that the emergency message tray contains the emergency message. 16. Claim 5 is characterized in that the facsimile device of the called station is provided with a function of displaying that the called station has received the emergency message, or a function of conveying it by voice. Facsimile communication method. 17. In claim 16, a sensor is provided to detect that the emergency message is contained in the emergency message tray, and the emergency message is periodically or irregularly loaded until the emergency message is taken out from the tray. A facsimile communication system characterized in that the facsimile device has a function of notifying the reception of an emergency message.