JP3454421B2 - Tone dial control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange (PBX) connected to a private branch exchange (PBX).
More specifically, the present invention relates to a tone dial control device that prevents erroneous dialing when making a call using MF). 2. Description of the Related Art Conventionally, there is a private branch exchange for connecting a public line network to a private line and performing telephone communication on an external line and an internal line. There are a pulse dial method and a tone dial method for dialing when making a call to an outside line or an extension from a premises. However, the pulse dial method is not used because it takes time to dial. In the case of an exchange used in the pulse dial system, the number of pulses is only counted, so there is almost no problem. In the case of the tone dial system, one DTMF receiver is used for one dial reception. I need. Since the DTMF receiver becomes unnecessary after the line is connected, a number smaller than the number of lines that can be exchanged by the PBX is usually prepared in the PBX. If a larger number of tone dials than the number of DTMF receivers are supplied at almost the same time, the DTMF receiver cannot cope with it and transmission becomes impossible. For example, in a switch having three DTMF receivers, if a third tone dial is supplied while the three DTMF receivers are in use, line connection cannot be performed even if the line is free. During the supply of the fourth tone dial, DTMF
When a receiver has a free space and receives a tone dial halfway, it may be connected to an incorrect dial number that is not the correct dial number. As described above, there is a limit to the tone dial simultaneous reception capability of the exchange, and if the number of transmissions exceeds the reception capability, the exchange cannot receive the dial information accurately, causing an erroneous dial. There was a possibility. Accordingly, an object of the present invention is to prevent erroneous dialing by controlling the tone dial not to be supplied to the DTMF receiver when simultaneous transmission exceeding the limit occurs. As a means for achieving the above object, a tone dial having M (M> 1) tone dial receivers for receiving tone dials transmitted from a premises is provided. A private telephone exchange for making a line connection to the number specified in the above, wherein a tone dial control device connected to the private branch exchange, wherein time information from when the tone dial receiver starts receiving the tone dial until when the process is completed. A timer for starting up when each of the tone dial receivers starts receiving a tone dial and counting up to time information stored in the storage unit; and a memory for storing the tone dial receiver. And a control unit for controlling the supply of tone dials to all the timers. In this case, a tone dial control device is provided in which the tone dial is not supplied to the tone dial receiver. An embodiment of a tone dial control device according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a private telephone exchange system using a tone dial control device of the present invention, and FIG. 2 is a flowchart showing the operation of the main part. In FIG. 1, an exchange (PBX) 1 is connected to an external analog public line network or ISDN line network.
It connects to the telephone line (extension) on the premises and connects the extensions to each other, and has the same configuration as the conventional PBX. This PBX 1 has M DTMs for receiving tone dials originated (called) from telephones on the premises.
An F receiver (tone dial receiver) 2 is provided.
In this embodiment, for the sake of convenience, the description will be made assuming that three (M = 3) DTMF receivers 2 are provided. The behind PBX device (tone dial control device) 3 is a control device connected to the inside of the PBX 1 (behind side), and from the start of reception of the tone dial by the DTMF receiver 2 to the end of the process. A storage unit 4 storing time information (time information from when the PBX 1 occupies the DTMF receiver 2 to when it releases the DTMF receiver 2),
Three timers 5 (the same number as the DTMF receiver 2) that start up when each DTMF receiver 2 starts receiving a tone dial and count up to the time information stored in the storage unit 4; And a control unit 6 for controlling the supply. When the behind-the-scenes PBX device 3 receives a tone dial transmitted from the premises while all the timers 5 are running, the control unit 6 controls so as not to supply the tone dial to the DTMF receiver 2. . Here, the time information stored in the storage unit 4 is the time information from when the DTMF receiver 2 starts receiving the tone dial to when the process ends, but actually, the time information differs depending on the PBX 1. Becomes For example, P
The BX1 has a timer that starts counting after a tone dial is input. If the timer is set to open the DTMF receiver 2 after 3 to 5 seconds from the start of counting or if an outside line is specified by calling 0 or the like. The DTMF receiver 2 is set to be opened when a ringback tone is detected or when the other party responds (when the polarity is inverted), and in the case of an extension, the required number of digits is input. At this point, the DTMF receiver 2 is set to be opened. Therefore, the P
The time from when the tone dial is transmitted from the behind PBX device 3 to the BX 1 until the DTMF receiver 2 is opened may be measured, and this time may be stored in the storage unit 4. The control unit 6 of the behind-the-scene PBX device 3
Are connected to the DTMF receiver 2 of the PBX 1 and to the repeater (base unit) 7 and a wired telephone (not shown). This repeater (parent device) 7 is for connecting a plurality of cordless telephones (child devices) 8 to a line. For example, a PHS (Personal Handy Phone System) telephone is used as the child device 8. In this case, usually, one repeater (master) 7 can simultaneously connect up to three lines. When an outgoing call (call) occurs from a certain slave unit 8 by a tone dial, the tone dial is supplied to the DTMF receiver 2 of the PBX 1 via the repeater 7 and the control unit 6, and the dialed calling number is transmitted. The line connection based on this is performed. Here, the tone dial connection control operation in the behind-the-scenes PBX device 3 will be described with reference to the flowchart shown in FIG. In the figure, when a tone dial (call request) from the slave unit 8 is supplied to the control unit 6 via the master unit 7 (step 21 → Y), the control unit 6 checks the current number of simultaneous calls. (Step 22). As a specific confirmation operation, a flag for counting the number of activated timers 5 is provided in the control unit 6, and the number of simultaneous calls can be confirmed by counting the number of the flags. . If the number of simultaneous calls is larger than the number of timers 5 (that is, the number of DTMF receivers 2) M (3) (step 22 → Y), the DTMF receiver 2 receives a tone dial. Therefore, the tone dial is not supplied to the DTMF receiver 2 and the calling handset 8 is notified by a signal or voice that calling is not possible (busy) (call stopping process, step 23). ). In step 22, if the number of simultaneous calls is smaller than M (3) (step 22 →
N), activate one of the timers 5 that have not been activated (step 24), add one to the number of simultaneous call flags (step 25), and return to the DTMF receiver 2 that does not use the tone dial. (Calling process, step 26). If there is no call request (step 21 → N), the timer 5 is constantly monitored, and when it is detected that the activated timer 5 is completed (step 2).
7), decrement the number of simultaneous call flags by one (step 2)
8). By operating as described above, the behind-the-scenes PBX device 3 can monitor the DTM only by monitoring the timer 5.
It is possible to determine whether or not the F receiver 2 is empty,
Even if the MF receiver 2 has no free space, there is no possibility that a tone dial is supplied to cause a possibility of an erroneous dial. At this time, since the DTMF receiver 2 is not directly monitored, there is no need to transmit / receive a control signal to / from the PBX 1. As a result, the behind-the-scenes PBX device 3 can be easily added later, regardless of the type of the PBX 1 and without modifying the PBX 1. FIG. 3 is a block diagram for explaining a specific embodiment of the tone dial control device of the present invention. In the figure, a tone dial control device (behind PBX device 3 shown in FIG. 1) of the present invention is realized by a personal computer 9 in which software having a PBX function is installed. And the hub (HUB) 1
A main line on the premises is constructed by using a (local area network) LAN 10 and digital wireless communication connected through the LAN 1. Further, similarly to the embodiment shown in FIG. 1, these components are connected to the behind side of the PBX 1. Then, the personal computer 9
It is connected to a LAN 10 via a hub (HUB) 11, and a digital cordless connection device (parent device) 12 is connected to the LAN 10. The digital cordless connection device 12 is a device for wirelessly connecting to a plurality of PHSs (child devices) 13 by extension. Further, the LAN 10 is connected to a telephone line connection device 14 for connecting the LAN 10 and a telephone line and performing mutual signal conversion.
The telephone line connected to the ordinary telephone 15 or the PBX 1 is connected to the telephone line side. In such a configuration, the personal computer 9 for realizing the tone dial control device includes:
As a natural configuration, a CPU (central processing unit, control unit)
It has a storage unit such as a RAM or a hard disk, and a timer function that measures the time by counting the internal clock. The process ends after the DTMF receiver 2 of the PBX 1 starts receiving the tone dial together with the software. The time information up to the time when the DTMF receiver 2 starts the tone dial reception is controlled by software so as to count up to the time information stored in the storage unit. When the telephone receives a tone dial transmitted from the premises during start-up, the present invention can be realized by controlling the software so that the tone dial is not supplied to the DTMF receiver 2, thereby preventing erroneous dialing. can do. The personal computer 9 has:
Circuit switching control software is also installed, LAN
Digital cordless connection device 12 connected to 10
Also, line switching control of the telephone line connection device 14 can be performed. Therefore, each PHS (child unit) 13
The line connection between the telephone and the telephone 15 is made by the personal computer 9. And PBX1
, The tone dial is output only when the line is connected to the outside line and the private line connected via the PBX 1. According to the tone dial control device of the present invention, P
When all the tone dial receivers in the BX are in use, the tone dial is not supplied to the tone dial receivers, so that there is an effect that erroneous dialing can be prevented. Further, since the tone dial receiver is not directly monitored, there is no need to transmit / receive a control signal to / from the PBX.
There is an effect that additional connection can be easily made later without modifying the BX.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an embodiment of a private branch exchange system using a tone dial control device of the present invention. FIG. 2 is a flowchart for explaining an operation example of the tone dial control device of the present invention. FIG. 3 is a configuration diagram showing a specific embodiment of a tone dial control device of the present invention. [Description of Signs] 1 Private branch exchange (PBX) 2 DTMF receiver (Tone dial receiver) 3 Behind PBX device (Tone dial controller) 4 Storage unit 5 Timer 6 Control unit 7 Repeater (base unit) 8 Cordless telephone ( Cordless handset)

Claims (1)

(57) [Claims 1] A line to a number specified by a tone dial having M (M> 1) tone dial receivers for receiving tone dials transmitted from the premises A private-area telephone exchange that performs connection, a tone dial control device connected to the tone dial control device, and a storage unit that stores time information from when the tone dial receiver starts receiving the tone dial to when the process ends. M timers that are activated when each of the tone dial receivers starts to receive a tone dial and count up to time information stored in the storage unit; and control supply of the tone dial to the tone dial receiver. A control unit that performs a call to the tone dial receiver when a tone dial transmitted from the premises is received while all the timers are running. Tone dialing control device being characterized in that so as not to supply the dial.