JPH082115B2 - Private branch exchange dial-in adapter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device installed between a subscriber exchange and a private branch exchange to perform a dial-in service.

(Prior Art) In recent years, a dial-in service to each extension telephone has been implemented for a private branch exchange, and in order to receive this service with an existing private branch exchange, the control system may be changed. , I was adding a signal receiving device.

(Problems to be Solved by the Invention) However, the change of the control method and the addition of the signal receiving device are individually supported depending on the type of the existing private branch exchange device, and there are technically unusable private branch exchange devices.

An object of the present invention is to provide a device which can be installed only between a subscriber exchange and a private branch exchange and can receive a dial-in service regardless of the type of the private branch exchange.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a device installed between a subscriber exchange and a private branch exchange to perform a dial-in service from the subscriber exchange. A connection control unit that detects and accepts each signal from the dial-in incoming call to the start of the call and controls the connection with the subscriber exchange, and is connected to the subscriber circuit of the private branch exchange to call the called party with a DP signal. Alternatively, the PB signal is used and the called party response is detected by loop reverse detection, and the called party is connected to the LD trunk of the private branch exchange by the DP signal and the called party response is detected by the polarity detection. It consists of an LD interface, forms each signal from the call to the called party by dial-in to the start of the call, and sends it to the private branch exchange. A dial-in adapter for a private branch exchange is provided, which comprises a paging controller for receiving and controlling each signal from the private branch exchange in connection with the transmission.

(Operation) According to the present invention, when there is a dial-in call from the subscriber exchange, the connection control unit establishes a connection with the subscriber exchange, and the call control unit sends or calls a call signal to the called party. The line check etc.
The call is controlled according to the type of connection method of the private branch exchange, and the call is controlled in cooperation with the private branch exchange.

(Embodiment) FIG. 1 is a relay system diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the function of the dial-in adapter in FIG.

In FIG. 1, LS is a subscriber exchange, PBX is a private branch exchange, DIA is a dial-in adapter, and the dial-in adapter DIA is easy to receive. NWA
Is a network and DII is a dial-in interface. One end of the dial-in interface DII is connected to the network NWA and the other end is a subscriber exchange LS.
It is used by being connected to a dedicated dial-in line L for receiving a dial-in service from a telephone, and forms a connection control unit for dial-in connection with the subscriber exchange LS. As shown in FIG. 2, a polarity detection circuit A, a loop closing circuit B, an incoming call detection circuit C, and a control circuit CN for controlling them.
Composed of T1. In addition, L1 and L2 are lines of the dial-in line L, and TA and TB are connection terminals on the line side.

The LCI is an LC interface corresponding to the case where the private branch exchange PBX is in the subscriber circuit direct connection system, one end is connected to the network NWA, and the other end is connected to the private branch exchange PBX of the system. Then, as shown in FIG. 2, the reverse detection circuit D1, the loop closing / DP sending circuit E1
And a control circuit CNT2 for controlling them. In addition,
LA and LB are connection terminals on the private branch exchange PBX side.

The LDI has an LD trunk, which is described later in the private branch exchange PBX, and is an LD interface corresponding to the case where the loop dial method is adopted by being used by being connected to the LD trunk. One end is connected to the network NWA. The other end is connected to the private branch exchange apparatus PBX of the method concerned (however, in FIG. 1, the private branch exchange apparatus of each method is commonly indicated by the reference symbol PBX, and the connection to both is also shown). . Then, as shown in FIG. 2, the polarity detection circuit D2,
It is composed of a loop closing / DP sending circuit E2 and a control circuit CNT3 for controlling them. TA and TB are connection terminals on the private branch exchange PBX side. The LC interface LCI and the LD interface LDI form a call connection unit.

The PB signal receiving circuit F shown in FIG. 2 receives the extension designation signal by the PB signal sent from the subscriber exchange LS side.
The extension number identifying circuit G identifies the extension number by the extension designation signal received by the PB signal receiving circuit F. When the extension number identified by the extension number identifying circuit G is a missing number, the voice message sending circuit H sends a voice message to that effect to the subscriber exchange LS. The PB signal transmission circuit K is
When the subscriber circuit is based on the PB signal, the PB signal is transmitted instead of the DP signal transmission in the loop closing / DP transmission circuit E1 of the LC interface LCI.
The time-out monitoring circuit M monitors the time-out for waiting when the called party is busy. The central control circuit CNT _c controls the connection of the network NWA and controls each control circuit CNT1, CNT2, CNT3, etc.

In the private branch exchange PBX, NWX is the network and LD is
LD trunks, COT are office line trunks, and LC1 and LC2 are subscriber circuits. The LC interface LCI of the dial-in adapter DIA is connected to the subscriber circuit LC1 and the LD interface LDI is connected to the LD trunk LD. Subscriber circuit LC2
An extension telephone (callee) TEL is connected to. The central line trunk COT receives the general line LG from the subscriber exchange LS and exchanges normal control signals and calls.

 The operation of the above configuration will be described below.

At the time of an incoming call, when the polarities of the dial-in lines L1 and L2 are reversed by the subscriber exchange LS, the polarity detection circuit A detects this, the incoming detection circuit C detects the ringing signal, and the loop closing circuit B joins. Create a loop state for the private branch exchange LS side. This timing is performed within 6 seconds after polarity reversal. Next, an extension designating signal based on the PB signal is sent from the subscriber exchange LS side. The PB signal receiving circuit F receives this signal, the extension number identifying circuit G identifies the extension designating signal, and the loop closing circuit. After looping the subscriber exchange LS side by B, LC interface LCI or LD interface L depending on the method of the private branch exchange PBX.
The extension number is sent to the private branch exchange PBX via DI. The transition from receiving the PB signal to breaking the loop is performed within 2.1 seconds.

 The call control will be described below for each of the above methods.

(1) When connected to the LC interface LCI, there are two ways to send the extension number to the extension telephone TEL, a method using the DP signal of 10PPS or 20PPS and a method using the PB signal. Closed loop / DP
After the loop is closed in the sending circuit E1, the signal is sent from the PB signal generating circuit K via the network NWA. The subscriber circuit LC1 connected to the LC interface LCI has a reverse function, and when the extension telephone TEL responds to the extension number transmission, the terminals LA and LB enter the loop state again, and the subscriber exchange LS side. A communication path is formed with and communication becomes possible.

When the extension telephone TEL is busy, the time-out monitoring circuit M monitors the time-out, and when the time-out occurs, the connection is switched to another extension telephone. That is, once the extension is released, the nearest new extension number is sent, for example. When the call ends, the reverse detection circuit D1 detects the reverse recovery due to the on-hook of the extension telephone TEL, and the loop closing circuit B recovers the loop on the subscriber exchange LS side.

(2) When connected to the LD interface LDI, the extension number transmission method to the extension telephone TEL is based on the DP signal of 10PPS or 20PPS, and is transmitted from the loop closing / DP transmission circuit E2. The LD trunk LD connected to the LD interface LDI is designed to invert the polarity according to the response of the extension telephone TEL. When the polarity detection circuit D2 detects this, the loop closing circuit B is used as in the case of (1) above. It becomes a loop again and the call becomes possible.

When the extension telephone TEL is busy or when the call is terminated, it is the same as the case (1).

In (1) and (2) above, from the subscriber exchange LS
When the extension number by the PB signal is a missing number, the voice message sending circuit H sends a voice message indicating that the number is missing to the subscriber exchange LS, and after a certain time, the loop is closed by the loop closing circuit B. To be done.

In the case of the above-mentioned missing number, instead of sending the voice message, the above-mentioned response when the called party is busy may be performed.

(Effects of the Invention) As described above, according to the present invention, a connection for detecting and accepting each signal from the arrival of dial-in from the subscriber exchange to the start of the call and for controlling the connection with the subscriber exchange. Connected to the control unit and the LC trunk of the private branch exchange, which is controlled by the subscriber circuit of the private branch exchange to perform the call of the called party by the DP signal or PB signal and the detection of the called party's response by the loop reverse detection. The private branch exchange device is composed of an LD interface for calling the called party by means of a DP signal and for detecting the called party's response by detecting the polarity, and forming each signal from calling the called party by dial-in to starting the call. And a call control unit for controlling the call by receiving each signal from the private branch exchange in connection with the sending. An appropriate dial-in service can be realized regardless of the necessity of changing the configuration.

[Brief description of drawings]

FIG. 1 is a relay system diagram showing an embodiment of the present invention, and FIG.
The figure is a block diagram showing the functions of the dial-in adapter. LS ... Subscriber switch, PBX ... Private branch exchange, LC1, LC2 ...
… Subscriber circuit, LD …… LD trunk, DIA …… Dial-in adapter, DII …… Dial-in interface, N
WA …… Network, LCI …… LC interface, LDI
...... LD interface.

Claims (1)

[Claims] 1. A device installed between a subscriber exchange and a private branch exchange to perform a dial-in service from the subscriber exchange, wherein each signal from the incoming dial-in from the subscriber exchange to the start of a call is transmitted. Connected to the connection control unit that performs detection, acceptance, and connection control with the subscriber exchange, and the subscriber circuit of the private branch exchange to connect the called party to the DP.
LC interface that performs callee response detection by loop reverse detection as well as signal or PB signal,
Connects to the LD trunk of the private branch exchange to DP the called party
It consists of an LD interface that performs signal detection and polarity detection of the called party's response, and forms each signal from calling the called party by dial-in to starting the call and sends it to the private branch exchange and A dial-in adapter for a private branch exchange, further comprising: a call control unit that receives and controls each signal from the private branch exchange.