JPH0563819A - Redialing system for private branch exchange - Google Patents

Abstract

PURPOSE:To connect a call to an opposite party when it is busy through recalling. CONSTITUTION:Dial numbers of telephone sets 2,3 are registered to a memory 11 with respect to one abbreviation dial number. When the operator A calls the abbreviation dial number from the telephone set 1, a central processing unit 10 receives the number, reads the relevant dial number of the telephone set 2 from the memory 11 and uses the number to call the telephone set 2. When the telephone set 2 is busy, a busy tone detection circuit 7 detects a busy tone signal from a switch 8 and it is noticed to the central processing unit 10. Thus, the central processing unit 10 reads other dial number corresponding to the abbreviation dial number, that is, the dial number of the telephone set 3 from the memory 11 and redials the telephone set 3 by using the number. When the telephone set 3 is not busy, line circuits 4, 6 are connected through a switch 8 to attain talking between the telephone sets 1, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redial system for a private branch exchange which accommodates a telephone having a calling function by a simple operation.

[0002]

2. Description of the Related Art Conventionally, when a telephone has a calling function by a simple operation, a call can be made by a simple operation such as a speed dial or a one-touch dial. By the way, when the call destination is busy, the speed dial or one-touch dial is operated again to make a call again.
Some telephones have an automatic redialing function, in which case the same dialed number is automatically redialed after a certain period of time.

[0003]

However, in any case, since redialing is performed with the same dial number, there is a high possibility that the user will be busy many times, and it will take time to connect to the other party. If it is not automatic, it takes time.

An object of the present invention is to solve such a problem and to provide a redialing system for a private branch exchange so that the other party can be quickly connected by redialing when the other party is busy.

[0005]

According to the present invention, there is provided a switch for accommodating a telephone having a calling function by a simple operation and for connecting the telephones or between the telephone and a public network, and a central processing unit for controlling the switch. In a redial system of a private branch exchange, a memory for storing a plurality of dial numbers corresponding to one simple operation, a busy tone detection circuit for detecting a busy tone signal output by the switch, and When an operation is performed, the dial number corresponding to the operation is read from the memory, the dialed number is used to make a call, and when the busy tone detection circuit detects a busy tone signal, the simple operation is performed. Read another dial number corresponding to from the memory,
It is characterized in that a calling means is provided for calling by the read dial number.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an example of a private branch exchange based on the redial system of the present invention. Reference numeral 1 denotes a telephone (TEL) used by the operator A, which has a speed dial function or a one-touch dial function as a calling function by a simple operation. On the other hand, the telephones 2 and 3 are telephones used by the operator B. The telephone 1 is a digital line circuit (D
LC) 4 while telephones 2 and 3 are respectively digital or analog line circuits (DLC / LC)
It is connected to 5 and 6. Reference numeral 9 is a station line trunk (COT) connected to a public network, and a switch (SW) 8 is provided between the line circuits 4 to 6, or the line circuits 4 to 6 and the station line trunk 9 are connected to a central processing unit (CPU). Connect under the control of 10. Reference numeral 7 denotes a busy tone detection circuit (BTREC), which detects a busy tone signal output from the switch 8 when the destination is busy and notifies the central processing unit 10.

The central processing unit 10 is connected to the line circuits 4 to 6 and the curved trunk 9, and the line circuits 4 to 6 are connected.
Signals are exchanged with each of the telephones 1 to 3 through 6, and on the other hand, when connecting to the public network, the central line trunk is controlled. Memory (MEM) 1 connected to the central processing unit 10
The central processing unit 10 stores a plurality of dial numbers for each speed dial number and a plurality of dial numbers for each one-touch key for one-touch dialing.

Next, the operation will be described. When using the speed dial function on the telephone 1, the operator A registers the dial number with the speed dial number of the telephone 1, and when the other party can use a plurality of telephones, the same speed dial number is used for registration. Repeat to register the dial numbers of other phones with the same speed dial number. Central processing unit 10
Receives these pieces of information through the line circuit 4 and writes a plurality of dial numbers in the memory 11 in association with one speed dial number. For example, when the operator A makes a call to the operator B, he / she inputs the dial numbers of the telephones 2 and 3 to a certain speed dial number, and these are stored in the memory in correspondence with the speed dial number by the central processing unit 10. 1
Registered in 1. The same applies to the case where the one-touch dial function is used, and when the operator A inputs the dial numbers of the telephones 2 and 3 from the telephone 1 to one one-touch key, the central processing unit 10 performs the one-touch dialing. It is registered in the memory 11 in association with the key.

After such registration, when the operator A dials the speed dial number from the telephone 1 to the telephone 2 of the operator B, the central processing unit 10 receives the speed dial number through the line circuit 4. .. Then, the central processing unit 10 takes out the first dial number stored in the memory 11, for example, the dial number of the telephone 2 in correspondence with the received speed dial number, and makes a call to the telephone 2 by the number. At this time, the central processing unit 10 simultaneously controls the switch 8 to connect the line circuit 5 and the line circuit 4, and the line circuit 5 to the busy tone detection circuit.

If the telephone 2 is busy,
A busy tone signal is sent from the switch 8 to the line circuit 4 and the busy tone detection circuit 7, and when the busy tone detection circuit 7 detects this signal, it notifies the central processing unit 10 of this.
Upon receiving this notification, the central processing unit 10 reads from the memory 11 another dial number registered corresponding to the speed dial number, that is, the dial number of the telephone set 3, and makes a call again to the telephone set 3 with the number. as a result,
When the telephone 3 is not busy, that is, the line circuits 4 and 6 are connected through 8 to enable a call.

[0011]

As described above, in the private branch exchange based on the redial system of the present invention, when a simple operation is performed by the telephone, the transmitting means reads out the dial number corresponding to the operation from the memory and transmits by the number. I do. When the other party is busy, another dial number stored in the memory corresponding to the simple operation is read,
Redial using the number. Therefore, when the other party has a plurality of telephones, the dialed numbers of the plurality of telephones are stored in the memory in association with one simple operation so that the dialed numbers can be used when busy. Is switched and redialing is performed, and quick connection is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a private branch exchange based on the redial system of the present invention.

[Explanation of symbols]

1 to 3 Telephone (TEL) 4 Digital line circuit (DLC) 5, 6 Digital or analog line circuit (DLC)
/ LC) 7 busy tone detection circuit (BTREC) 8 switch (SW) 9 office line trunk (COT) 10 central processing unit (CPU) 11 memory (MEM)

Claims (3)

[Claims] 1. A redial system of a private branch exchange, which accommodates telephones having a calling function by a simple operation and includes a switch for connecting telephones or telephones to a public network, and a central processing unit for controlling the switch. A memory for storing a plurality of dial numbers corresponding to one of the simple operations, a busy tone detection circuit for detecting a busy tone signal output by the switch, The dial number corresponding to the operation is read out from the memory, the dial number read out is used to make a call, and when the busy tone detection circuit detects a busy tone signal, another dial number corresponding to the simple operation is set. A redundancies of the private branch exchange, which is provided with a calling means for reading from the memory and making a call by the read dial number. Dial system. 2. The redial system for a private branch exchange according to claim 1, wherein the simple operation is a speed dial operation or a one-touch dial operation. 3. The redial system for a private branch exchange according to claim 1, wherein said transmitting means is constituted by said central processing unit.