JPH05227296A - Private branch of electronic automatic exchange - Google Patents

Abstract

PURPOSE:To make automatic calling to a caller by displaying a number and a name of the caller onto an extension telephone set at the end of the call of an extension when a call comes from a trunk line to a busy extension. CONSTITUTION:When a call comes from a subscriber 2 to a busy extension, a central controller 7 stores a caller number in a received message to a caller number storage memory 9. When the end of a call of an extension subscriber 1 is detected, a name of the caller is retrieved from a caller information registration memory 11 based on the stored caller number and displayed on an extension telephone set. When the extension subscriber 1 depresses a call button of the extension telephone set, a setup message is sent from the caller number in the caller number storage memory 9 to an ISDN network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic automatic private branch exchange accommodated in an ISDN network.

[0002]

2. Description of the Related Art In a conventional electronic automatic private branch exchange, IS
When a subscriber accommodated in the DN network receives an incoming call to the busy extension, the extension subscriber cannot know the presence of the incoming call when busy.

[0003]

In the above-mentioned conventional electronic automatic private branch exchange, when a call is received from a busy extension, the extension subscriber cannot know the presence of the call, and the caller cannot There was the annoyance of having to repeat the call until the extension stopped talking and became empty.

An object of the present invention is to provide an electronic automatic private branch exchange in which an extension subscriber can confirm an incoming call during a call and can automatically make a call to a calling party. It is in.

[0005]

According to the present invention, in an electronic automatic private branch exchange having a function of being accommodated in an ISDN network, a means for receiving a calling number and a calling subaddress from the network and registering them in a calling party number storage memory. And a means for retrieving the name of the calling party from the calling party information registration memory and displaying it on the display unit of the extension telephone.

Further, according to the present invention, by pressing the call button of the extension telephone, the ISDN from the caller number in the caller number storage memory is passed through the D channel controller.
Preferably, means are provided for sending the call setup message to the network.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a connection state diagram of an electronic automatic private branch exchange showing an embodiment of the present invention. 1 is an extension subscriber, 2
Is a subscriber accommodated in the ISDN network, 3 is a line circuit for an extension terminal, 4 is an ISDN trunk, 5 is a D channel control device, 6 is a speech path switch, 7 is a central control device, 8 is a caller number storage Section, 9 is a calling party number storage memory, 10 is a calling party information registration section, 11 is a calling party information registration memory, 12
Is an ISDN network.

Next, the operation of this embodiment will be described.

The subscriber 2 accommodated in the ISDN network is
Sends a call setup message to the ISDN network 12,
Call to trunk 4. When the central control unit 7 detects that the extension to be connected is busy from the called number in the message received from the ISDN network 12 through the D channel control unit 5, the calling number and the calling subaddress in the same message (hereinafter, referred to as The calling party number) is stored in the calling party number storage memory 9. When the extension call is detected, the central control unit 7 retrieves the name of the calling party from the calling party information registration memory 11 based on the calling party number in the calling party number storage memory 9, and the extension telephone set. Is displayed on the display.

Next, when the extension subscriber presses the call button of the extension telephone, the central control unit 7 causes the calling party number storage memory 9 to operate.
From the calling number in the I channel through the D channel controller 5.
A call setup message is sent to the SDN network 12.

As described above, in this embodiment, when a caller accommodated in the ISDN network receives a call to the busy extension, the caller's number and name are displayed on the extension telephone when the extension is terminated. By pressing the call button, it is possible to automatically call the caller.

[0013]

As described above, the present invention provides ISD.
When a caller accommodated in the N network receives an incoming call to a busy extension, by displaying the caller number and the name of the caller on the display of the extension telephone at the end of the extension, the extension subscriber Will be able to check for incoming calls when
Further, by pressing the call button of the extension telephone, it is possible to automatically call the caller.

[Brief description of drawings]

FIG. 1 is a connection state diagram of an electronic automatic private branch exchange showing an embodiment of the present invention.

[Explanation of symbols]

 1 Extension subscriber 2 Subscriber accommodated in ISDN network 3 Extension subscriber line line 4 ISDN trunk 5 D channel control device 6 Speech path switch 7 Central control device 8 Caller number storage unit 9 Caller number storage unit Memory 10 Caller information registration unit 11 Caller information registration memory 12 ISDN network

Claims (2)

[Claims] 1. An electronic automatic private branch exchange having a function of being accommodated in an ISDN network, means for receiving a calling number and a calling subaddress from the network, and registering the calling number and a subaddress in a calling number memory, and a calling information registration memory. An electronic automatic private branch exchange characterized in that it further comprises means for retrieving the name of the calling party and displaying it on the display of the extension telephone. 2. A means for transmitting a call setup message to an ISDN network from a calling party number in the calling party number storage memory by pressing a calling button of an extension telephone, through a D channel control device. The electronic automatic private branch exchange according to claim 1.