JPH0468997A - Key telephone system - Google Patents

Abstract

PURPOSE:To group plural B channels of an ISDN line by providing a line management means in a key telephone master system. CONSTITUTION:A key telephone master system 20 is provided with a line control means 23 sending and receiving information to/from an ISDN line 22, a call processing means 24 controlling a key telephone set 26, and a line management means 25 applying group management to lines. When a call comes to the line control means 23 of the key telephone master system through the ISDN line 22, the line management means 25 is informed of an incoming number via the call processing means 24. The line management means 25 converts the incoming number into a prescribed line number based on a predetermined conversion table and displayed on a trunk line button of the key telephone set 26 grouped Thus, plural B channels of one ISDN line 22 are grouped like analog lines.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a button telephone device for connecting to an ISDN line and performing voice and data communications.

BACKGROUND OF THE INVENTION FIG. 3 shows a conventional structure of this type of key telephone device. In FIG. 3, -1 is the key telephone main device. 2 has multiple information channels)v (hereinafter referred to as B channel/L/) and one control channel A/(hereinafter referred to as D channel/L/).
It is connected to the button telephone main device 1 via an SDN line and a line control means 3. Reference numerals 6 and 8 are key telephones, with 6 illustrating a typical key telephone. Further, 7 is a central office line button of the key telephone 6. These button telephones 6.8 are connected to the key telephone main unit 1 through the extension control means 4. Further, the line control means 3 and the extension control means 4 exchange control information with the call processing means 6 to realize various functions.

Next, the ISDN line incoming call method will be explained using the above configuration. The ISDN line 2 generally has a plurality of B channels, and one B channel corresponds to one conventional analog line. Therefore, when one ISDN line 2 is used, multiple analog lines can be used, which is efficient.

Generally, when a button telephone device receives an incoming call notification from the ISDN line 2, the following two methods are used. However, subaddress notifications that are not directly related to the present invention will not be explained.

(1) When the M number is not notified If the call processing means 6 is notified of an incoming call through the ISDN line 2 and the line control means 3, and the called number, which is the address of the called party, is not notified within the information, the call processing means 5 This incoming call is assumed to be to an unspecified person, and is displayed on the open area of the office line button 7 of the key telephones 6 and 8 through the extension control means 4, thereby notifying the user.

? 〉 When the called number is notified In the same way as when the called number is not notified, the call processing means 6 that receives the notification of the call will control the extension control means to a specific extension telephone set in advance or a group thereof according to the notified called number. Notify the incoming call through 4.

In this way, even with the above-mentioned conventional button telephone device, it is possible to display an incoming call notification to an unspecified person or a specified person on the button telephone 6.8 based on the called number notification.

Problems to be Solved by the Invention However, due to the relationship between the conventional button telephone device and the ISDN line, there has been a problem in that the following advantages of the button telephone cannot be utilized.

The advantage is the grouping of lines. Figure 4 shows its configuration. In FIG. 4, 1o is a key telephone main device, 11 and 12 are analog line groups, and 13 and 14 are key telephone groups.

When analog line group 11 and button telephone group 13 are made to correspond, and analog line group 12 and button telephone group 14 are made to correspond, each button telephone group 13
．． The office line button on the 14-button telephone can display only the status of each line of the corresponding analog line group. This can be achieved because there is a one-to-one correspondence between analog lines and station line buttons, and each analog line is given a number by the station.

However, in ISDN line 2, multiple B channels are used in one line, so it is necessary to display the status of each B channel on the office line button of all key telephones 6 and 8. I can't. Because ISDN
If you are notified of an incoming call from line 2, you will be asked to specify which B channel to use, so press the B channel and station line button 7.
This is because if one-to-one correspondence is used, it is impossible to know which central office line button 7 should be used to display an incoming call. In addition, even with the method of notifying a designated button telephone group of an incoming call by notifying the called party number, the called number and B channel are completely independent, and the incoming call is sent to the central office line button of the grouped telephone. cannot be displayed.

The present invention solves these conventional problems,
The object of the present invention is to provide an excellent key telephone device that can display multiple B channels of an ISDN line in groups of central office lines, which is an advantage of conventional key telephones.

Means for Solving the Problems In order to achieve the above object, the present invention provides a key telephone main device which includes a line control means for exchanging information with the ISDN line, a call processing means for controlling the key telephone, and a line control means for exchanging information with the ISDN line. This system is equipped with line management means for group management.

Effect The effect of the above configuration is as follows. When the line control means of the key telephone main unit receives a call through the ISDN line, the line management means 26 is notified of the called number via the call processing means 24. The line management means converts this called number into a predetermined line number based on a predetermined conversion table and displays it on the office line button of the key telephone set.

Therefore, according to the present invention, multiple B
Channels can be grouped like analog lines, and the advantages of conventional key telephones can also be utilized on ISDN lines.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 2o is the key telephone main unit, 21 is the ISD
N network, and both are connected by an ISDN line 22. For the purpose of explanation, ISDN 4-wire 22 is used as the network 1500 of Nippon Telegraph and Telephone Corporation (hereinafter referred to as NTT).
(23B f channel and control channel) service. The ISDN line 22 exchanges information with the line control means 23, and the call processing means 24 controls call information. 25
is a line management means, which is a means for processing a plurality of B channels of the rsDN four-wire 22 as a button telephone line.

Next, the operation of the above embodiment will be explained. ISDN line 22 has 23 B channels. In other words, it is equivalent to 23 conventional analog lines. However, typically one ISD
Since only one called number is given to the N line, the number becomes like the representative number of 23 B channels, and this number is divided into 1 group within the button telephone, for example, 10.
If you use NTT's DDI (Direct Dial-In) service, where you cannot divide the books into Group A and the remaining 13 books into Group B, there are multiple called numbers and their notifications on one line. In some cases, a maximum of 23B channels of incoming calls to one called number occur simultaneously, and even if it is possible to display an incoming call to another specific group based on this called number, the lines cannot be divided into groups.

The line management means 25 uses the called party number notification of the DDI service to group lines.

The line management means 25 is notified of the called number by the call control means 24 when a call is received on the ISDN line 22.

The line management means 25 has in advance a destination number and line conversion table shown in FIG. The lines mentioned here are lines that can be handled in the same way as conventional analog lines, and are displayed on the office line buttons of the grouped key telephones 26. The line management means 26 is a line corresponding to the called party number.
A line on which the call can be received is selected from among the lowest numbers and notified to the call processing means 24, and the call processing means 24 designates the line as a central office line button and displays an incoming call on the telephone 26. Further, when the line management means 26 cannot receive a call on all the lines corresponding to the called party number, the call processing means 24 notifies the call processing means 24 of rejection of the call, and the call processing means 24 sends a call to the ISDN network 20 through the line control means 23.
Notify the recipient that the call will be rejected. According to the present invention, it is possible to specify a line for displaying an incoming call based on the called party number, and it is possible to group these lines into key telephone groups.

1. If you want to use the same as the conventional 23 analog lines, you can create a one-to-one conversion table between called number and line, and if you make all called numbers correspond to line 23, for example, Even when there are no free lines in each group, the present invention allows a central reception desk or an automatic response device to receive incoming calls as the four lines 23.

Effects of the Invention As is clear from the above embodiments, the present invention provides a line management means in the button telephone main device, and can handle and group multiple B channels of an ISDN line like conventional analog lines. It has this effect.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of a button telephone device according to an embodiment of the present invention, FIG. 2 is a conversion table of the called party number and line number referred to by the line management means of the present invention, and FIG. 3 is a conventional button telephone device. FIG. 4 is a schematic diagram showing the configuration of the telephone device, and is a conceptual diagram illustrating grouping of key telephones. 1...Button telephone main device, 2...IS
DN line, 3...Line control means, 4...
・Extension control means, 5...Call processing means, 6...
...Button telephone, 7...Station line button, 8.
...Key telephone, 1o...Key telephone main device, 11.12...Analog line group, 13.14...Key telephone group, 2o...
...Key telephone main device, 21...ISD
N network, 22...ISDN line, 23...
・Line control means, 24...Call processing means, 26.
... Line management means, 26 ... button telephone. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (2)

[Claims] (1) ISDN in key telephone main unit connected to ISDN line with multiple information channels and one control channel.
A button telephone device is provided with a line control means for exchanging information with a line, a call processing means for controlling a button telephone, and a line management means for handling an ISDN information channel as one line. (2) The button telephone device according to claim 1, wherein the line management means has a conversion table between called number and line number.