JPH0686345A - Private branch exchange system - Google Patents

Abstract

PURPOSE:To provide a function equivalent to the trunk line inter-calling service (DID) of NTT between a key telephone set and the extension telephone set of a private branch exchange system. CONSTITUTION:PBX extension telephone sets 11, 12, 13,... and an extension 14 which is an extension DID line are connected to the extension side of a private branch exchange 10 and a main device 16 of the key telephone system 15 is behind-connected to the extension 14. The key telephone sets 17, 18, 19... are connected to the main device 16, a DID signal call originating circuit 20 is provided in the private branch exchange 10 and a PBREC 21 is provided in the main device 16. The DID signal call originating circuit 20 converts call originating signals from the PBX extension telephone sets to signals indicating the extension specifying number (the extension DID number of PBX) of the key telephone set and the extension number of the main device 16 in the private branch exchange 10 and originates calls. The PBREC 21 which detected them converts the signals indicating the extension specifying number to the signal indicating the extension terminal number of the key telephone set at the central unit and performs DID calling for which the corresponding key telephone set is directly called.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has the same function as a DID (Direct In Dial) service for a central office line, which has been conventionally implemented as an additional service of NTT (Nippon Telegraph and Telephone Corporation), on the side of a private branch exchange telephone device. The present invention relates to a private branch exchange telephone device, which can be realized by.

[0002]

2. Description of the Related Art Conventionally, in a key telephone device, NT
As one of the T additional services, a DID service; so-called dial-in is prepared. According to the DID service, after an incoming call from an outside line (NTT office line) is detected, for example, by receiving a signal (PB signal) representing an extension designation number issued from the station, the extension connection is established with the key telephone device. You can call individual key telephones. On the other hand, in a private branch exchange telephone device constituted by connecting at least one extension telephone to the private branch exchange (PBX), behind-connecting the main device of the button telephone device, and connecting at least one key telephone device to the main device, Individual extension calls can be made mutually between extension telephones or between key telephones which are extension telephones of a key telephone apparatus.

[0003]

However, in the private branch exchange telephone device having the above configuration, for example, as shown in FIG. 3, the PBX extension telephone 50 having the extension number "240" and the button telephone 54 having the extension number "232" are connected. When calling
For example, the button telephone 53 with the extension number “231” is the main device 57.
A PBX extension telephone with extension number "240" if it is a button telephone connected to the local line DIL (Direct In Line)
The operator (caller) of 50 calls "23" to call the main unit 57 of the key telephone unit connected to the extension 58 corresponding to the extension "230" as seen from the private branch exchange (PBX) 56.
When "0" is entered, the PBX extension telephone set 50 and the main unit 57 are connected, and the button telephone set 53 of the extension number "231" connected to the extension terminal number "11" of the main unit 57 and the office line DIL is called. Then, the person who answers the key telephone has the extension "2" which is the transfer destination for the call to be transferred to the key telephone 54.
Since the desired call is made by performing the operation of inputting "32", the key telephone cannot be called directly from the PBX extension telephone side after all.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by adding to the main unit of a private branch exchange and a key telephone device a function capable of directly calling an individual button telephone from an extension telephone of the private branch exchange. And

[0005]

To this end, a private branch exchange telephone device of the present invention comprises a private branch exchange, at least one private branch exchange telephone connected to the private branch exchange, and a private branch exchange behind the private branch exchange. In a private branch exchange telephone device comprising a main unit of a key telephone unit to be connected and at least one key telephone unit connected to the main unit, when calling one of the key telephone units from one of the extension telephone units. The private branch exchange is provided with a signal transmitting circuit for converting the outgoing signal issued to the private branch exchange to a signal representing the extension number of the main unit in the private branch exchange and a signal representing the extension designated number of the key telephone set, and providing the signal to the private branch exchange. The signal transmitted from the transmitting circuit is detected and a signal representing the extension designation number is output to the extension end of the key telephone in the main unit. A signal detecting circuit for converting the signal representing the number is characterized in that comprising provided in the main apparatus.

[0006]

According to the present invention, when an extension telephone of a private branch exchange calls a desired key telephone, the caller simply inputs the extension number of the key telephone, and the signal provided in the private branch exchange. A transmission circuit converts a transmission signal generated by the input operation into a signal representing an extension number of the main device and a signal representing an extension designated number of the key telephone in the private branch exchange, and transmits the signal to the main device in response. Since the provided signal detection circuit detects each signal transmitted from the signal transmission circuit and converts the signal representing the extension designation number into a signal representing the extension terminal number of the key telephone in the main unit, the private branch exchange It is possible to directly call a desired key telephone directly from the extension telephone.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of a first embodiment of a private branch exchange telephone device of the present invention, in which 10 is a private branch exchange (PB).
X) is shown. The private branch exchange 10 is usually connected to a plurality of outside lines (NTT line) not shown on the outside line side, and usually a plurality of PBX extension telephones 11, 12, 13, ... On the extension side.
・ Is connected. At that time, the extension numbers of the respective PBX extension telephones are set to "240", "241", and "242", respectively.

The extension 14 of the private branch exchange 10 is further connected to the extension 14 corresponding to the extension number "230" as viewed from the private branch exchange, and the main unit 16 of the key telephone unit 15 is connected behind the extension 14. Extension 14 is extension D as shown below.
It is designated as an ID line and corresponds to one of the above-mentioned outside lines on a one-to-one basis. Although the most simplified configuration is shown in FIG. 1 for easy understanding of the description, a plurality of button telephone devices as described above may be provided, or one button telephone device may be provided with
A plurality of extension lines may be connected in a one-to-one correspondence with outside lines.

Extension terminal numbers "11" and "1" of the main unit 16
2 ”,“ 13 ”, ... are button telephones 17, 18, respectively.
19, ... are connected. At that time, the extension numbers of the key telephones are set to “231”, “232”, and “233”, respectively. In the connection form of the button telephone device of the present embodiment, all button telephones are connected to the main device 16 by a central line DIL (Direct In Line), as will be described in detail below. Only the key telephone set 53 with the number "231" is connected to the main unit 57 by the office line DIL, which is markedly different from the conventional example.

By the way, in the present invention, the private branch exchange 10
And by making the following hardware and software changes to the main unit 16, the DID call (DID incoming) of the key telephone from the extension telephone of the private branch exchange is realized as the purpose of the present invention. Therefore, private branch exchange 10
The DID signal transmission circuit 20 is installed in the
A signal detection circuit (PB Receiver, hereinafter referred to as PBREC) 21 is provided at 16. The private branch exchange 10 and the main unit 16
Is provided with a control circuit (CPU, etc.), a memory, etc. (not shown) that performs predetermined control based on various input signals.

The DID signal transmitting circuit 20 is one of the extension telephones.
T (for example, PBX extension telephone 11 with extension "240")
To one of the key telephones (eg, key telephone 18)
An outgoing signal (extension number "23
2 ”) to the main unit 16 in the private branch exchange 10.
Signal indicating the extension number "230" of the telephone and the extension designation number (extension DID number of PBX) of the key telephone "2.
Converted to a signal (PB signal) representing "32" and transmitted.
It has a DID transmission function. In addition, PBREC21 is DI
Each signal transmitted from the D signal transmission circuit 20 is detected, and P
It has a DID receiving function for converting a B signal into a signal for calling a corresponding key telephone.

In order to exert the DID transmitting function and the DID receiving function as described above, on the PBX side,
The extension "230" is designated as the extension DID, and the extension DID numbers are "231", "232", and "233".
Is set, and the extension 14 connected to an outside line (not shown) is designated as a DID line on the key telephone device side, and
When the extension DID number "231" is received, the extension terminal "1"
Set to receive the call at "1" and the extension DID number "23"
It is assumed that the extension terminal "12" is set to receive an incoming call when "2" is received, and the extension terminal "13" is set to receive an extension DID number "233".

Next, referring to FIG. 2, the P of the extension "240" is used for direct individual call of the key telephone of this embodiment.
The case where the BX extension telephone 11 calls the button telephone 18 having the extension number "232" will be described as an example. That is,
In FIG. 2 showing the connection operation sequence for calling the extension DID of this embodiment, first, the PBX with the extension number “240” is used.
From the extension telephone 11 to the button telephone with the extension number "232"
To call 18, when a call (call) signal representing "232" is issued and input to the private branch exchange 10, the private branch exchange 10 determines that the signal is a signal representing an extension DID number, and then outputs the DID signal. Operates the transmission circuit 20 (for example, the PBX extension telephone with the extension "242")
If the signal representing 23 is issued, the DID signaling circuit 20 does not operate and the extension call is made in the normal PBX).

At this time, the DID signal transmitting circuit 20 first
A call signal for capturing the extension "230" to which the button telephone 18 to be called, which is designated as the extension DID line, is sent to the main unit 16 of the button telephone apparatus 15 (this call signal is generated, for example, by L1). Signal and L
2 by inverting the signal). The main unit 16 receiving this calling signal returns a primary response signal to the private branch exchange 10 through a DC loop. Next, the DID signal transmission circuit 20 of the private branch exchange 10 receiving the primary response signal instructs the main unit 16 to specify the extension number (extension DID) of the button telephone 18 to be called.
A signal representing "232" which is the number) is emitted as a PB signal.

Next, the P of the main unit 16 receiving this PB signal
The BREC 21 analyzes this PB signal and makes a TEL call to the key telephone (that is, the key telephone 18) connected to the extension terminal number "12" of the main device 16, and
An extension-designated reception completion signal is issued to the private branch exchange 10. This T
When the key telephone 18 which has received the EL call responds to the telephone (TEL response; operation to raise the hook switch), the main unit 16 issues a secondary response signal to the private branch exchange 10 (this secondary response signal is not generated). This is a function not provided in the conventional key telephone, and is generated by the circuit that generates the above primary response signal). Then, the private branch exchange 10 receiving the secondary response signal, the main device 18 and the PBX.
A direct current loop is formed between the extension telephones 11, and a call is made between them. In addition, when there is no response in the key telephone 18 due to, for example, "busy" at the time of calling the TEL, a predetermined process (for example, PB
It is assumed that the "extending tone" is issued to the X extension telephone set 11).

Through the above series of processing, the extension number "24"
The extension terminal number "1" of the PBX extension telephone 11 of "0" and the key telephone apparatus 15 connected behind the private branch exchange 10 is "1".
The key telephone 18 connected to "2", the extension "23
It is possible to directly call the DID call as the "2" extension telephone individually, and at that time, it is possible to handle the same as the extension numbers "241" and "242" of the private branch exchange 10 (the key telephone device). 15 extension "23
From the "2" button telephone 18, PB of extension "240"
It goes without saying that the X extension telephone 11 can be directly called individually).

In the above-mentioned embodiment, the configuration is such that the DID function is added to the normal button telephone device, but the DID service-compatible button telephone device of NTT (the main device is provided with PBREC). Can be used as is without changing anything, in which case PB
All that is required is to add a DID function to the X side.

Further, in the above embodiment, in the case where a plurality of extension lines corresponding to the outside line in a one-to-one correspondence are connected to the key telephone device 15, when the called extension line is in use, another extension line is captured to call the DID. By setting the software so as to perform the above procedure, it is possible to solve the problem that the DID cannot be called even though the other extension is vacant.

[0019]

As described above, according to the present invention, the function of making an extension call to each button telephone directly from the extension telephone of the private branch exchange is added to the main equipment of the private branch exchange and the button telephone system. Therefore, a caller can directly call a desired key telephone from the extension telephone of the private branch exchange simply by inputting the extension number of the key telephone.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of a first embodiment of a private branch exchange telephone device of the present invention.

FIG. 2 is a diagram showing a connection operation sequence of extension individual calling in the same example.

FIG. 3 is a diagram showing a configuration of a conventional private branch exchange telephone device.

[Explanation of symbols]

 10 Private branch exchange 11 PBX extension telephone 12 PBX extension telephone 13 PBX extension telephone 14 Extension (DID line) 15 Button telephone equipment 16 Main equipment 17 Button telephone 18 Button telephone 19 Button telephone 20 DID signal transmission circuit 21 Signal detection circuit (PBREC)

Claims (1)

[Claims] 1. A private branch exchange, an extension telephone for at least one private branch exchange that is connected to the private branch exchange, a main unit of a key telephone device that is behind-connected to the private branch exchange, and connected to the main unit. In a private branch exchange telephone device comprising at least one key telephone, a calling signal issued when one of the extension telephones calls one of the key telephones, and an extension number of the main device in the private branch exchange. The private branch exchange is provided with a signal transmission circuit for converting into a signal representing the signal and a signal representing the extension designated number of the key telephone and transmitting the signal, and a signal representing the extension designated number is detected by detecting the signal transmitted from the signal transmission circuit. The main device is provided with a signal detection circuit for converting into a signal representing an extension terminal number of the key telephone set in the main device. Characterized by comprising, private branch exchange telephone system.