JPS5972289A - Connecting method of private branch electronic exchange - Google Patents

Abstract

PURPOSE:To prevent malfunction by collating a PB signal from a touch tone telephone set with the contents of a dial data table, and specifying a trunk line trunk according to the result to form a channel. CONSTITUTION:A touch tone dialing type telephone set 1 is connected to a PB control CPU9 through a line interface circuit 2, a connection network 4, and a receiver 8. When the telephone set 1 is put in an off-hook state, a dial tone is sent to the telephone set 1 from a tone generator 7 through a DTMF receiver 8. The PB signal of the telephone set 1 is deciphered by the receiver 8 and collated with the contents of the dial data table 10. A network connection control CPU11 forms the channel between the interface circuit 2 and trunk line trunk 5 according to the collation result.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for connecting private electronic branch exchanges using a method such as a distributed function type.

Conventional configurations and their problems When dialing a subscriber's number in a central office through a private branch exchange using a conventional touch-tone dialing (R/T) telephone, the first central office line (external line) trunk access is If the key is held down for a long time, the private branch exchange will use the signal from the key to complete the central office line trunk acquisition operation, connect the caller to the central office line, and send the central office trunk access key signal to the central office. On the other hand, this is determined to be the first dial of the called party, resulting in a defective connection.

As a countermeasure, there is a method of establishing a communication path between the caller's Knote Tone Dial telephone and the station's line interface circuit after confirming the detection of the end of the key press following the detection of the first key press. However, according to this method, the connection operation is always started only when the end of key press is detected, so when connecting with a line interface other than the station, such as an extension, there is a drawback that the coordination of operations is lost.

OBJECTS OF THE INVENTION It is an object of the invention to provide a connection system for electronic exchanges that eliminates the above-mentioned conventional drawbacks and eliminates malfunctions.

DESCRIPTION OF THE INVENTION The present invention provides an F B (Pu
5h Button) signal is not sent to the central office line, and by detecting the first key press, the dial tone is stopped and the signal content of the first one or more PB doubles is used to either an internal or external line. It is configured to distinguish between the caller's PB double signal line interface circuit and control the typing connected to the caller's PB double signal line interface circuit.

Description of examples The present invention will be explained below by way of an embodiment thereof with reference to the drawings.

In the drawing, 1 is a touch tone dial type telephone, 2 is a line innocouface circuit, and 3 is a line phone.
4 is a connection network, 5 is a central office line trunk, 6 is a central office line trunk control CPU, 7 is a tone generator, 8 is a receiver, 9 is a PB control CPU, 10 is a dial data table, 11 is a network connection control CPU, 12
is the pass line.

Next, the operation will be explained.

When the telephone 1 goes off-hook, it is detected by the line interface circuit 2, and the line interface control CPU 3 sends DTM to the network connection control CPU 11.
F (Dial Tone MultiFregu
tone generator 7
A dial tone is sent from the DTMF receiver 8 to the telephone set 1. When a key is pressed on telephone 1, the PB double signal is sent to DTMF receiver 8, and the DTMF receiver
8 detects key press, and in PB control CP99, O
The N flag is set to 1, and the DTMF receiver 8 reads the PB subsign and compares it with the contents of the dial data table 10 in which the deviated central office line dial number information is stored. In the case of an access signal, while holding the reading result, it waits until the end of the key press, that is, the end of the PB double signal is detected. This sets the OFF flag to P
The B control CPU 9 sets it to 1, sends the reading result to the line interface control CPU 11'3, and sends the result from the line interface control CPU 3 to the network connection control GPU 11.
The network connection control CPU 11 sends a connection request signal to the central office line trunk, and controls the central office line trunk 5 to form a communication path between the line interface circuit 2 and the central office trunk 5 in the connection network 4. As a result, the PB double signal from the telephone set 1 is sent to the office via the office line trunk, etc., and becomes the subscriber dial of the office. On the other hand, if it is determined to be an extension, the connection is made immediately without waiting for the end of pressing the key.

The pass line 12 is a line ink-face control CP.
U3. Office line trunk control CPU6. PB control CPU9.
It constitutes a common bus line for communication between CPUs such as the network connection control CPU 11.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the PB double signal from the touch-tone telephone is compared with the contents of the dial data table, and based on the results, the connection timing is determined and the call path is established after specifying the central office trunk. is formed, so it has the advantage that it does not cause malfunction and can be used in a system having both an extension line and an outside line.

[Brief explanation of the drawing]

The figure is a block diagram of an apparatus using a method for connecting a private electronic branch exchange according to an embodiment of the present invention. 1... talking m, 2... line interface (b) path, 3... line interface control CPU. 4... Connection network, 5... Office line trunk, 6
・・・・・・Station line trunk control CPU, 7・・・・・・
1.-/generator, 8...rember, 9...
...pB Control CPU, 10...Dial data table, 11...Network connection control G
PU, 12...Pass line.

Claims (1)

[Claims] detecting a caller's key press operation for generating a PB signal, and stopping the dial tone according to the detection result;
The central office line dial information is checked against the stored dial data table, and the timing and destination of connection to the PB double signal line interface circuit on the calling side are determined depending on whether the PB double signal is a central office line dial or not. 1. A method for connecting an electronic private branch exchange, comprising: controlling a key press operation; and stopping a dial tone to a caller upon detection of the key press operation.