JPS6023539B2 - Facsimile calling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for distinguishing facsimile communication calls from telephone calls in facsimile communication using a telephone network.

In recent years, facsimile communications that use telephone networks have become widespread, but most exchange machines do not distinguish between telephone and facsimile calls, and even facsimile calls use the same ringing signal as regular telephone calls. is being sent.

For this reason, even in the case of a facsimile communication call, the bell of the telephone rings and the facsimile communication begins after a conversation between the sender and the receiver. Furthermore, when an automatic reception device is added, the telephone bell rings several times before proceeding to facsimile communication.

For this reason, even in the case of facsimile communication, if the recipient is called by a ringing bell, and conversely, in the case of telephone communication, if the recipient does not respond within several rings, the system will forcibly switch to the facsimile receiving device. There were some inconveniences such as being exposed. In this way, telephone communication calls and facsimile communication calls are made without distinguishing between them, and as a result, the characteristics of facsimile communication, which is a recorded communication and does not require a response from the operator, cannot be utilized, and telephone communication calls are called as facsimile calls. There were problems such as connection to the device.

One way to distinguish between telephone and facsimile is to install a device that inverts the DC polarity for each subscriber line, and to set the polarity according to each communication, but in this case, the capacitor in the telephone circuit is used to charge and discharge This may cause a problem called "ringing," in which the bell rings momentarily.

In order to eliminate these drawbacks, the present invention distinguishes between a telephone communication call and a facsimile communication call at an exchange, and when it is identified as a facsimile communication call, it sends out a facsimile signal that does not ring the telephone bell. The drawings will be described in detail below. First, a call is made from the calling telephone 1, and when the call is detected by the exchange 2,
Under the control of the control section 3, the telephone 1 is connected to the dial receiving section 5 via the communication path switch section 4, and a dial tone is sent from the receiving section 5.

The caller hears the dial tone and dials a special number indicating that it is a facsimile bond call, such as 1-sa, and the number (telephone number itself) of the facsimile receiving terminal with which the caller is communicating.

The dial receiving unit 5 of the exchange 2 receives the number,
When the control unit 3 analyzes the number 1 fence and identifies that it is a facsimile communication call, it selects the facsimile ringing signal sending trunk 6 and sends the facsimile to the facsimile receiving terminal via the communication path switch unit 4. A calling signal is sent to 7.

By using an audible signal sound as loud as the IK side or higher as this calling signal, the facsimile receiving terminal 7
The bell of the telephone 8 on the receiving side that is paired with the telephone 8 is prevented from ringing. When the facsimile receiving terminal 7 detects the sent calling signal and automatically answers, the facsimile calling bond sending trunk 6 detects the response signal and connects it to the telephone 1 via the call path switch section 4. The facsimile transmitter terminal 9 and the facsimile receiver terminal 7 are connected,
Facsimile communication begins. On the other hand, the calling phone 1
In the case of a telephone communication call that calls the called telephone 8 from
If the special number 1 is not sent and the controller 3 analyzes it and finds that it is a telephone communication call, it selects the trunk 10 for transmitting a false call signal and calls the called telephone 8. A signal is sent out. This call signal generally includes 18
Since a low frequency signal of about 100 MHz is used, the bell of the telephone 8 rings, and the facsimile receiving terminal 7 does not respond. When the receiver answers by taking the called telephone 8 off-hook, the receiver is connected to the calling telephone 1 and telephone communication is started. Although exchange 2 identified it as a facsimile communication call only by the lxy number, in order to increase reliability, facsimile communication has a subscriber data file device that records whether or not the subscriber has a facsimile terminal. In the case of a call, the exchange 2 can also confirm whether the called party has a facsimile terminal.

Further, although the above description has been made regarding a circuit switching type communication form in which the switching center 2 connects terminals to each other, the present invention can also be applied to a store and forward type communication form via a storage center.

As described above, according to the facsimile calling system of the present invention, the switching center distinguishes between telephone communication calls and facsimile communication calls and sends out a ringing signal, thereby allowing facsimile calls to be made without requiring a response from the called party. This also prevents telephone communication calls from being connected to facsimile machines.

Furthermore, since the facsimile calling signal is an audible signal of approximately IKHz or higher and does not depend on switching of DC polarity, so-called tingling does not occur. Further, this calling signal is sent using a trunk for sending out a facsimile calling signal, so that the trunk for sending out a facsimile calling signal can be effectively used without providing one for each subscriber, and the structure can be constructed at a lower cost.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of a facsimile calling system according to the present invention. 1: Calling side telephone, 2: Exchange, 3: Control section, 4: Call path switch section, 5: Dial receiving section, 6: Trunk for transmitting facsimile ringing signals, 7: Facsimile receiving terminal,
8: Receiving side telephone; 10: Trunk for transmitting telephone ringing signals. figure station

Claims (1)

[Claims] 1. In facsimile communication using a telephone network, the first means for identifying whether it is a facsimile communication call or not, and the method of transmitting an audible signal of approximately 1 KHz or higher that does not cause the telephone bell to ring when it is identified as a facsimile communication call. A second signal sent from the signaling trunk as a facsimile calling signal.
A facsimile calling system characterized in that a switching center is provided with means for: