JPH05328423A - Subordinate pbx connection system - Google Patents

Abstract

PURPOSE:To attain identification of an incoming call and an outgoing call and to send and receive information between a host PBX and a slave PBX by using an interface circuit for a multi-function telephone set for a trunk connected to the host PBX. CONSTITUTION:A multi-function telephone set interface trunk 3 is made up of a channel switch interface section 11 sending a voice signal and controlling a channel switch 2, a line interface section 13 using a line interface circuit of a multi-function telephone set, a voice signal control section 12 extracting the line interface section 13 and sending it to the channel switch interface section 11, an information transmission reception section 14 extracting incoming call information from the line interface control section 13 and sending it to the control section 15, and the control section 15 controlling the multi-function telephone set interface trunk 3 entirely. Then the interface between the channel switch 2 and a central processing unit 4 is provided with the same control section as a general office line trunk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subsequent PBX connection system in a system for operating a PBX by connecting another PBX to an extension circuit of the PBX.

[0002]

2. Description of the Related Art Conventionally, an analog telephone interface has been used for this type of connection system. this is,
The outgoing call was a DC loop signal, the incoming call was an AC signal, and the dial information after the outgoing call was a DC loop pulse.

[0003]

In the above-mentioned conventional connection method, since the information transmission means at the time of incoming call is only the AC signal, when the incoming call is identified as to what kind of incoming call it is, the AC signal is transmitted. This is done by distinguishing the intermittent time and the intermittent cycle, or by distinguishing the frequency of the AC signal. The former can be implemented at low cost, but in practice there is a problem that only two patterns can be distinguished, and in the latter, there are many patterns that can be distinguished, but a frequency discriminating circuit etc. is required and it is expensive to implement. There was a problem of becoming.

[0004]

According to the rear PBX connection system of the present invention, another PBX is connected to an extension circuit of the PBX to provide a PB.
In the X operation system, the interface circuit of the multifunctional telephone is used for the line interface unit of the trunk connected to the upper PBX, and the interface between the speech path switch and the central processing unit has the same control unit as a general office line trunk. It is the one.

[0005]

In the present invention, by using the interface circuit of the multi-function telephone in the line interface section of the trunk connected to the upper PBX, it is possible to identify information other than the call origination and the call reception between the upper PBX and the lower PBX. To be able to send and receive.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of the present invention, showing a configuration example of a relay system. In FIG. 1, 1 is a rear PBX, and this rear PBX 1 is composed of a speech path switch 2, a multifunction telephone interface trunk 3 and a central processing unit 4. 5 is the upper PBX
The upper PBX 5 is composed of the multifunction telephone interface line circuit 6 and the communication path switch 7. Reference numeral 8 indicates a public network. In this way, the interface circuit of the multifunction telephone is used in the line interface section of the trunk connected to the upper PBX 5.

FIG. 2 is a block diagram showing a configuration example of the multi-function telephone interface 3 in FIG. This Figure 2
In FIG. 1, the same reference numerals as those in FIG. 1 indicate corresponding parts, and the multi-function telephone interface trunk 3 is connected to the PBX speech path switch 2, and a speech path switch interface section 11 for transmitting voice signals and controlling the speech path switch 2 is provided.
And a line interface unit 13 using a line interface circuit of a multifunction telephone and a voice signal from the line interface unit 13 and sent to the call path switch interface unit 11 or a voice signal from the call path switch interface unit 11 An information transmission / reception unit 14 and a central processing unit that take incoming information from the voice signal control unit 12 and the line interface unit 13 to be sent to the interface unit 13 and send it to the control unit 15 or send outgoing information from the control unit 15 to the line interface unit 13. 4 is composed of a control unit 15 which is connected to the multi-function telephone interface trunk 3 to control the whole. The interface between the communication path switch 2 and the central processing unit 4 is the same as the control unit 15 of a general office line trunk.
Is configured to have.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described. First, a PBX higher than the public network 8 in FIG.
The incoming call is made to P5 by PBX dial-in or individual incoming call system. Then, the host PBX 5 identifies this by a trunk and a central processing unit (not shown), and puts the specified multifunction telephone interface circuit 6 on the extension side into an incoming state. The multifunction telephone interface circuit 6 sends incoming call information and incoming call identification information from the public network 8 to the line interface unit 13 of the multifunction telephone interface trunk 3 of FIG. 2 under the control of a central processing unit (not shown). Then, the line interface unit 13 of FIG. 2 receives the information, and the information transmitting / receiving unit 14 takes out the information and controls the control unit 15.
Send to. The control unit 15 sends the incoming call information and the incoming call identification information from the public network 8 to the central processing unit 4 in FIG.

Next, the central processing unit 4 displays the incoming call at the succeeding PBX 1 by an extension telephone or an incoming call processor (not shown) under normal incoming call processing control. At this time, at the same time, the extension telephone or the incoming call display (not shown) performs a special display in the sense that the incoming call is from the public network 8 according to the incoming call identification information from the public network 8. As a result, the extension handler can identify the incoming call from the public network 8. When the extension responds, the central processing unit 4 identifies it and performs normal response control, and at the same time, the control unit 1 of FIG.
5 to the response control information. This control unit 15 controls the communication path switch interface unit 11 so that the voice signal is transmitted as shown in FIG.
1 so as to communicate with the communication path switch 2 of FIG.
The response information is sent to the upper PBX 5 of the.

The upper PBX 5 sets a public network 8 and a speech path switch 7, and the public network 8, the speech path switch 7, the multi-function telephone interface line circuit 6, the line interface section 13 of FIG. 2, the voice signal control section 12, A voice signal is transmitted to the extension of the rear PBX 1 through the call path switch interface unit 11 and the call path switch 2 of FIG.

[0011]

As described above, according to the present invention, the upper PB
By using the interface circuit of the multi-function telephone in the line interface section of the trunk connected to X, it is possible to send and receive information in addition to identifying the incoming call and the incoming call between the upper PBX and the lower PBX. Upper PBX
There is an effect that information other than the normal outgoing / incoming call information can be transmitted / received between the subordinate PBX and the subsequent PBX at a low cost. As a result, it is possible to distinguish between incoming calls from the public network in the secondary PBX and incoming calls from the extension of the upper PBX, which has been difficult in terms of cost until now, with a special display such as a lamp display, and at the same time as the normal incoming call display. It has an effect that it can be performed immediately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a multifunction telephone interface trunk in FIG.

[Explanation of symbols]

 1 Rear PBX 2 Call path switch 3 Multi-function telephone interface trunk 4 Central processing unit 5 Upper PBX 6 Multi-function telephone interface line circuit 7 Call path switch 8 Public network 11 Call path switch interface section 12 Voice signal control section 13 Line interface section 14 information transmitter / receiver 15 controller

Claims (1)

[Claims] 1. In a method of operating a PBX by connecting another PBX to an extension circuit of the PBX, an interface circuit of a multi-function telephone is used in a line interface section of a trunk connected to an upper PBX, and a speech path switch and central processing are performed. A rear PBX connection system characterized in that the interface with the device has the same control unit as a general office line trunk.