JPH0261198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for transmitting key-in tones in a telephone switching device such as a button telephone device.

[Prior art]

When a dial operation is performed on a push-button dial telephone, a confirmation tone is normally sent to the telephone each time the dial operation is confirmed. This confirmation sound is generally called a key-in tone.

By the way, for example, in the case of a so-called standalone telephone that is directly connected to a central office line, the telephone is usually equipped with a dial signal oscillator, so a key-in tone can be easily sent to the telephone by branching and transmitting the output of the oscillator to the receiver. . However, in a button telephone device, for example, when a dial operation is performed on the telephone, dial information is sent from the telephone in the form of data to the main device, and the dial sender of the main device sends a dial signal to the central office line based on the above data. (so-called sender method).

In the telephone exchange system using the sender method described above, a key-in tone generator is required because the dial signal cannot be used as it is as a key-in tone.

In conventional key telephone devices, each telephone has a key-in tone generator, and the key-in tone is transmitted from the dialed telephone to the handset.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional technology, a key-in tone generator is required for each telephone set, which not only makes the system expensive, but also sends out dial information and key-in tones separately. A failure may occur where only one of the two is sent. Such failures cause erroneous connections or disconnections.

The present invention is proposed to solve the above problems.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a key-in-tone generator in the main device, and when the main device receives dial information transmitted by dialing on a telephone, controls a call path switch to A telephone is connected to the key-in tone generator to send a key-in tone to the telephone, and if there is a communication path connected to the telephone at this time, the connection between the communication path and the telephone is maintained while the key-in tone is being sent. The connection path is opened to prevent key-in tones from being sent to the communication path.

[Embodiments of the invention]

The drawing is a block diagram showing the relevant parts when the present invention is implemented in a button telephone device.

As shown in the drawings, in the button telephone device according to the embodiment, a communication path switch (hereinafter referred to as a switch) 1 of the main device ME includes a telephone TEL, a communication line of a central office trunk 2, and an output of a key-in-tone generator 3. The dial sender 4 output line is directly connected to the office line trunk 2. Also, the phone
The telephone, switch 1, central office trunk 2, key-in-tone generator 3 and dial sender 4 are each connected to the central processing unit 5 by control lines.

When the central processing unit 5 reads the central office line selection information from the telephone TEL, seizes the central office line trunk 2, and switches the central processing unit 1 to control to close cross points P ₁ and P ₂ . By being captured, the central office line trunk 2 forms a closed loop with the central office line CO and enters the central office line originating state. As a result, a dial tone is sent from the central office line CO, and the dial tone passes through the central office line trunk 2, switch 1 cross points P ₂ and P ₁ , and is sent to the telephone TEL.
is transmitted to. In this way, the telephone TEL is connected to the central office line CO.
When you make a call to , a communication path is established with the central office line CO before dialing.

If you dial the phone number here,
The dial information sent from the telephone TEL is read into the central processing unit 5 via the control line, and when the central processing unit 5 reads the dial information, it controls the switch 1 to close the cross points P ₃ and P ₄ and close the central office line. At least one of the cross points P ₁ and P ₂ connecting the CO and the telephone TEL is opened, and the key-in tone generator 3 is activated. The key-in tone output from the key-in tone generator 3 is sent to the telephone TEL via cross points P ₄ and P ₃ of the switch 1. At this time, at least one of the cross points P ₁ and P ₂ of switch 1 is open, so the key-in tone is transmitted via the cross points P ₄ , P ₃ , P ₁ , and P ₂ to the central office line CO.
There is no possibility that it will be sent to (office line trunk 2).

The above operations are performed every time the dial button is pressed on the telephone TEL.

When the central processing unit 5 reads the dial information, it controls the central office line trunk 2 and
At the same time, the dial sender 4 is connected to, and activated, the dial information is translated into a dial signal, and the dial signal is sent from the dial sender 4 to the office line CO via the office line trunk 2.

The above operations are performed in the same way in dialing operations performed after the communication path between the telephone TEL and the called party is completed. Such dialing operations include, for example, dialing operations in end-to-end communication (communication when data is exchanged between the telephone TEL and the database when the called party is, for example, a database).

For example, in cases where the telephone does not have a central office line button, such as a private branch exchange, and the central office line is captured using a cable, the central office line call identification dial (usually a "0" dial) is performed on the telephone. In some cases, a communication path to the central office line has not yet been established. Therefore, in such a case, control to open the communication path (control to open the cross points P ₁ and P ₂ of the switch 1) is necessary.
is not required.

〔Effect of the invention〕

As explained above in detail, according to the present invention, only one key-in tone generator is required in the main device, so the system can be configured at low cost, and the key-in tone does not require dialing information to be received by the central processing unit. This has the effect of reducing the number of erroneous connections or disconnections due to incorrect dialing.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment of the invention. (Main symbols) ME...Main equipment, TEL...Telephone, 1...Switch, 3...Key-in-tone generator.

Claims (1)

[Claims] 1. A key-in-tone generator is provided in the main device, the output line of the key-in-tone generator is housed in a call path switch, and each time a dial operation is performed on the telephone, the call path switch connects the telephone and the key-in-tone generator. and sends a key-in tone to the telephone, and if there is a call path connected to the telephone, the call path switch sends a key-in tone to the telephone while the telephone and key-in tone generator are connected. A key-in tone transmission method that opens the connected communication path.